the more i read
Thread Starter
|
Logistics Pro
Joined: Mar 2005
Posts: 3,771
Likes: 80
From: tujunga, calif
the more i read
with all the great info here, the more I read the more confused I get, somewhere people were saying certain oils are not good for flat tappet cams, I never knew that!!! I use a 10-30 with a SL rating, is there a problem?
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
There may be a problem when SL oil is replaced by SM. As the phosphorus limits continue to fall in newer oil formulations, the amount of ZDDP EP/AW additive falls with it. Virtually all newer cars and light trucks use roller cam followers, so this is not harmful to new engines still under warranty. With the government mandated extended warranty on emissions items, including the cats, the automakers and lube oil blenders are in kind of a formulation bind. Funny how the engine itself is only warranted to 36,000 miles but the cats to 100,000. No wonder we have 5W-20 with low ZDDP.
The single highest friction/wear point in the engine is the cam-lifter interface, that is why roller cams are standard now. Some of the new SM oils, like Chevron/Havoline and Pennzoil contain a lot of moly to replace the zinc. This may take care of the problem.
If you are really worried about it, use a good HDMO, like Chevron Delo 400, but they are not sold in 10W-30 here in SoCal. 15W-40 is not too thick here anyway, since it is rated for cold cranking down to +4F.
Jim
The single highest friction/wear point in the engine is the cam-lifter interface, that is why roller cams are standard now. Some of the new SM oils, like Chevron/Havoline and Pennzoil contain a lot of moly to replace the zinc. This may take care of the problem.
If you are really worried about it, use a good HDMO, like Chevron Delo 400, but they are not sold in 10W-30 here in SoCal. 15W-40 is not too thick here anyway, since it is rated for cold cranking down to +4F.
Jim
Posting Guru
Joined: Jul 2001
Posts: 1,914
Likes: 1
Noting that in your profile your driveway must look like an oldy car show, even the SL rated oils are going to be weak for these engines. There are options for you though. Because of the lowering of the ZDDP anti-wear agents and that the engines were made way before any limits were set, you need to find either an additive or an oil with lots of the ZDDP. You can use Amsoil HDD by the quart as an additive to your Chevron oil or you can buy Valvolines Synpower additive which has about 2400 ppms of ZDDP. I would use a half of a bottle or 6 oz per 5 qt oil change. This would bring the add pack up to where it should be for these older engines.
Thread Starter
|
Logistics Pro
Joined: Mar 2005
Posts: 3,771
Likes: 80
From: tujunga, calif
Flash..thanks for the info, one 66 mustang has a new 302 roller cam motor, so I guess its safe..thank you for the kind words (old car show), my wife calls it a junk yard.........LOL
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
Originally Posted by jimandmandy
With the government mandated extended warranty on emissions items, including the cats, the automakers and lube oil blenders are in kind of a formulation bind. Funny how the engine itself is only warranted to 36,000 miles but the cats to 100,000. No wonder we have 5W-20 with low ZDDP.
A better comparison may be the DM (direct material) cost between CATs and engines, and I bet that the DM cost of an engine is at least 10 times as much as the DM cost of a CAT in a given car.
Last edited by aurgathor; May 11, 2005 at 08:12 PM.
Thread
Thread Starter
Forum
Replies
Last Post
Amelio
6.2L V8
90
Mar 16, 2014 06:15 PM
zehcnasca
1973 - 1979 F-100 & Larger F-Series Trucks
6
Nov 10, 2011 10:33 PM
