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  #1  
Old 02-05-2004, 03:41 PM
apb apb is offline
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Synthetic Oil - Group III and IV?

What's all the controversy about Synthetic Oils?
Seems that many "synthetic" oils are not what we would assume they are.
Syntech, which I have used, seems to be particularly questionable...

Anyone understands this well enough. Does it mean that only Mobil 1 can be trusted? Can it truly be trusted?

I change oil every 5000 mi on a M119 engine (8.5 quarts). It's a pain and I won't do it every 3000 mi.
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Old 02-05-2004, 04:36 PM
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Please do a search the discussions on synthetic oil are endless. Do a search and enjoy
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  #3  
Old 02-05-2004, 06:18 PM
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lubricant information

Go to this link for a series of articles on base oils, conventional, "synthetic", and synthetic.

www.chevron.com/prodserv/baseoils/articles_papers.shtml
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Old 02-05-2004, 06:47 PM
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Answered my own question, POAs are the way to go

http://www.chevron.com/prodserv/baseoils/docs/npra_paper.pdf

Good Bye Syntech . . . Don't want something substantially similar, albeit inferior.
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  #5  
Old 02-05-2004, 11:12 PM
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Group III & PAOs

Yeah, the group IV PAOs are probably the way to go at this time. I run 0W-40 Mobil 1 in the C43 and 5W-30 Syntec in my wife's 325i for warranty reasons. Eventually I'll put Mobil 1 in the 325.

However, I suspect the III and IV base oils are pretty close in performance. I think the real benefits are in the additive packages, and in how much money a formulating company is willing to spend on testing.

If Chevron upgraded their Supreme motor oils to a Group III base oil (I think they are currently a II or II+) at the same price or slightly higher they would have a goldmine.
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  #6  
Old 02-06-2004, 01:11 AM
Bud
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Mobil 1 switched their 5W-30 and 10W-30 oils from a base IV to a base III to compete with other oil companies who got away with calling petroleum base III oils a synthetic.

If you compare the old Mobil 1 30 weight's pour point with the current ones, you'll see that there was a change when they regressed to base III.

Mercedes no longer approve of these two oils.

I believe the new 0W-30 is a true base IV and of course so are 0W-40 and 15W-50.
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