95 C4 993

Does it really matter if you use Mobil 1 15-50 vs. 15-50 EXTENDED LIFE ? I chance my oil ever 3k anyway. My thoughts are it cant hurt any.

GrantG

You may want to reconsider using any version of Mobil 1 15W50 - they have reformulated it will far less wear protection to meet new regulations:

http://www.lnengineering.com/oil.html

MarkD

My eyes glazed over after the first page. I think I am impressed... but I'm not sure.

Can anyone put this into plain language? Mobile 1 good/bad?

I didn't think I was stupid but perhaps I should reconsider.

viperbob

You want the Extended Performance formula. That is pretty much the original formula. The newer formulas are NOT good for wear on the engine.

Mark in Baltimore

Bob,

Maybe I misread it, but I thought even the EP's were not as good.

I have to say, this whole issue has me worried. I've been looking into Amsoil for all of my cars.

DJF1

http://www.mobil1.com/USA-English/Mo...1_15W-50_.aspx

Alas, there maybe hope... The "new" 15-50, hopefully its the old formula...

From the site: "Mobil 1 15W-50 is also recommended for older valve train designs that may benefit from a higher level of anti-wear normally not required for newer generation vehicles. Mobil 1 15W-50 will also provide better anti-wear protection for higher valve spring tensions in certain racing engines. "

Spuds993

I may be wrong but wasn't the general consensus that we should continue with the same oil (M1 15-50 for most of us) with the addition of a bottle of the "GM Engine Oil Suppliment (EOS)"?

I've ordered six bottles from these guys:
http://www.sdparts.com/

Seems like a reasonable solution to the problem.

JPS

ViperBob...thoughts on that solution (additive?)

GrantG

If you look at the Mobil website, you'll see that this "new" 15W-50 is API rated "SM" which means it will have low levels of ZDDP (if it conforms to its rating)

agdamis

Bob is saying Extended is the call, DJ has founded "back by popular demand oil from Mobil 1" what are we thinking here fellas? Is there a consensus.

GrantG

Charles Navarro is going to be testing the new 15W-50 oil shortly and posting on his site (http://www.lnengineering.com/oil.html), although my expectations are low, since it's SM-rated. Charles is recommending Mobil 1 V-Twin 20W-50 for warm weather.

Best price is here (free shipping if you buy 16qts or more):
http://www.amazon.com/exec/obidos/tg...F7RX4&v=glance

JPS

Motorcycle oil?

GrantG

Yup - for aircooled motorcycles

Read the link for the reasons:

http://www.lnengineering.com/oil.html

Mostly doesn't need to comply with emission controls that are the cause for the reduction of wear protection additives...

GrantG

Guys, in case I sound like Chicken Little, my decision to stop using Mobill 1 15W50 (or add some additive like GM EOS) was based on chats with Steve Weiner @ Rennsport, Jerry Woods, and other legitimate experts who are all advising a change of oil (or addition of additive). I may try Swepco 306 15W40 which also has alot of support...

Mark in Baltimore

Grant,

What does everyone say about Amsoil?