Switching to synthetic oil - Chevelle Tech
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post #1 of 20 (permalink) Old Sep 9th, 19, 9:59 PM Thread Starter
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Jerry
 
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Switching to synthetic oil

This isn't the usual engine talked about on here but a 2002 6 liter in a pickup with about 130,000 miles. Apparently all that has been used for the last 70,000 miles is dino oil, not sure about the first 60k, although I amsume it had synthetic at some point.
There shouldn't be any negatives about switching would there?

Jerry
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post #2 of 20 (permalink) Old Sep 9th, 19, 11:02 PM
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Re: Switching to synthetic oil

I wouldn't!

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post #3 of 20 (permalink) Old Sep 9th, 19, 11:30 PM
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Re: Switching to synthetic oil

Care to elaborate why, Leo?

I switched to synthetic in my '02 Ram 4.7L about 25K ago - it now has 159K, and I haven't noticed any issues.

David

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post #4 of 20 (permalink) Old Sep 10th, 19, 8:58 AM
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Jim
 
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Re: Switching to synthetic oil

In 99 I bought a 95 GMC it had 59K on it, I changed to 0W-30 Mobil 1. Still used a quart to 1500-1800 till 175k & rust took it's life.

Jim

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post #5 of 20 (permalink) Old Sep 10th, 19, 9:28 AM
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Re: Switching to synthetic oil

I wouldn't switch. The moving parts are seated and/or clearanced w/ the dino oil. Switching will change the internals of the engine and IMO you're more likely to have engine issues. Or maybe just oil consumption, if you're lucky.
This is just my opinion and is based on what I've read from guys who have switched.

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post #6 of 20 (permalink) Old Sep 10th, 19, 9:53 AM
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Re: Switching to synthetic oil

I wouldn't switch at this time on such a high mileage engine. And I wouldn't use any kind of high mileage oil (which are typically synthetic anyway).
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post #7 of 20 (permalink) Old Sep 10th, 19, 11:51 AM
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Re: Switching to synthetic oil

The only issue I ever knew about was the sealing issue. Any old seals in the engines were more susceptible to leaking due to the synthetic oil.
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post #8 of 20 (permalink) Old Sep 10th, 19, 11:59 AM
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Re: Switching to synthetic oil

Snake oil in a silly putty engine, NOPE. Snake oil in a later, hardened internal parts engine, fine.
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post #9 of 20 (permalink) Old Sep 10th, 19, 8:55 PM
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Re: Switching to synthetic oil

A 2002 6.0 with 130,000 miles Is not even broke in if you have kept up with oil changes like every 3000 miles or so.

I have went back and forth in many vehicles testing Synthetic vs conventional and those engines never had a singleand they all went 250,000 miles and driving one now with 326,000 miles on it.

There is an issue with the GM 6.0 and cam bearings if you are not aware of that.
many of the LS cams I see at the cam shop have destroyed the mains on the cam.
For some reason people must not be keeping up with oil changes or using crap oil.

Or maybe GM messed up somewhere. Not enough oil flow there??
Maybe it is people use crap oil and go 1000 miles or more between changes..I have seen it and it's not pretty.

Friend Just took a 6.0 apart with 65,000 miles on it and it looked all new ..We reground the cam more lift and duration and I ported the heads stuck 313 rate springs on it and he is running VR1 silver bottle and sometimes Driven LS synthetic oil.

No issues at all and shift at 7000 rpm. daily driver in a mid 70's long bed Chevy.

I will say the exhaust valves were severely pitted ..No rotators and those OD transmissions keep RPM way down and the valve just does not rotate well. That is my take on it.
65,000 miles and the exhaust valves looked 3X worse than my 100,000 mile 1969 300HP 350 with 186 heads.

Havoline conventional was used since day 1 in the 1969 engine.
Of course back then I read the ZDDP was like 1400 PPM and there was lead in the fuel until 1986 or so.
I got the 1969 300HP engine in 1992.

Toss a coin.. would I change to synthetic.
Yes.
Would I use walmart synthetic ? NO.
I still like my Zinc.
It protects more parts than just flat tappet lifters.
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post #10 of 20 (permalink) Old Sep 10th, 19, 9:03 PM
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Re: Switching to synthetic oil

Our local popular oil change company has their own synthetic-dino blend bottled for them. It's all I've run for many years. I figure I get the best of both. Never had any issue with it.

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post #11 of 20 (permalink) Old Sep 11th, 19, 2:41 PM
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Jim
 
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Smile Re: Switching to synthetic oil

Quote:
Originally Posted by blumont View Post
This isn't the usual engine talked about on here but a 2002 6 liter in a pickup with about 130,000 miles. Apparently all that has been used for the last 70,000 miles is dino oil, not sure about the first 60k, although I amsume it had synthetic at some point.
There shouldn't be any negatives about switching would there?
There shouldn't be...but I would not switch. Why not?

Primarily because a saying that is one of my favorites goes: "If it ain't broke, don't fix it." That has worked well for me and goes well with me, cuz I'm somewhat cheap and lazy.

Secondarily: Also, I tend to be superstitious about some things...
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post #12 of 20 (permalink) Old Sep 11th, 19, 2:50 PM
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Jim
 
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Quote:
Originally Posted by jeff swisher View Post
A 2002 6.0 with 130,000 miles Is not even broke in if you have kept up with oil changes like every 3000 miles or so...

I have went back and forth in many vehicles testing Synthetic vs conventional
Toss a coin.. would I change to synthetic.
Yes.
Would I use walmart synthetic ? NO.
I still like my Zinc.
It protects more parts than just flat tappet lifters."
What's wrong with SuperTech? I use it in my cars, pickup, lawnmower, roto-tiller, chainsaw...it's good stuff.

Here's the incontrovertible proof:

https://duckduckgo.com/?q=supertech+...ai=zwqt5vI0o1A
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post #13 of 20 (permalink) Old Sep 11th, 19, 3:44 PM
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Re: Switching to synthetic oil

When I tested super tech synthetic in my 95 corolla it returned 29 MPG.
Conventional was 27 MPG castrol synteck was also 29 MPG.
Royal purple was giving me 33 MPG as was Mobil 1 synthetic 33 MPG.

During testing each oil stayed in the car for 1000 miles and got a new filter.
Same paths driven and this car gets this MPG from the day I got it with 74,000 miles on it..It now has 326,000 and then some.

In 2007 the mobil 1 synthetic took a crap and my mpg went to 30.
I used it in my mowers and one rider started a bearing squeal right after I changed the oil from the old to the new blend.

I switched out of the Mobil synthetic to Rotella T6 in all my vehicles and to my surprise it gave me 35 MPG and it was a heavier weight than the other oils I tested.

Then they changed it
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post #14 of 20 (permalink) Old Sep 11th, 19, 6:51 PM
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Re: Switching to synthetic oil

No problems going to synthetic; most of the stuff on here and online are outdated wive's tales... If your engine is not burning oil, I'd go with a good synthetic and change it every 10K or more, or not "change it" at all...I can see some of you spitting up the drinks now...

I bought an 05 Suburban; 5.3 liter, 125K miles...Ran it for a while to make sure it didn't use, burn or leak; went through a qt every 5k miles which is nothing. I switched to synthetic and I change filter every 5-7K, add the oil to make up for the burned qt and the filter, and DO NOT drain the pan.....no problems at 165K. This is a highway driver that gets HOT every time it's driven so not a bunch of condensation/water built up on 3 mile drives...

I'm still amazed so many are using 50 year outdated ideas about oil quality and change intervals...Even the Walmart "Super Tech" synthetic is very good stuff...

Bob
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post #15 of 20 (permalink) Old Sep 11th, 19, 7:01 PM
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Re: Switching to synthetic oil

I bought my 2003 Ford Ranger with 67,000 miles on it ....
I switched at the first oil change to 5-20 Mobil 1 ...
The manual says 5-20, so I stuck with it....
The only difference I see is 2-3 mpg increase ...
No leaks ....
It now has 84,000 on it ....
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