[DeTomaso] Busted Big, but Reno anyway? - cams and oil with ZDDP - LONG

[Thomas Tornblom]

Barry Seib skrev:
> Thomas
> In my opinion, any oil that can meet an API designation of SM is not
> suitable for flat tappet or racing use, BUT I'm not an expert.
> 
> I have been reading
> 
> http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=postlist&Board=11

Check this:

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1491262#Post1491262

This appears to be the European 0W-40 Mobil 1, which from the comments 
appears to be different from the US spec Mobil 1.

As I'm using a roller cam and full roller rockers, I believe the only 
sliding contact surfaces left are the distributor/oilpump gear, which is 
a Crane steel gear. The gear looked fine when I removed the distributor 
and replaced it with the cam sensor, on which I installed a new Crane 
steel gear, with lots of moly grease.

Thomas

> 
> and it seems even some testing labs results are inconclusive but I'm
> thinking I'm going to send some some samples in myself for testing. Sounds
> like Polaris labs is a good one and there's one in Canada that they say is
> good too.
> Maybe I should have just added my own ZDDP and been done with it.
> 
> Barry
> 
> -----Original Message-----
> From: Thomas Tornblom [mailto:Thomas.Tornblom at hax.se]
> Sent: Friday, June 12, 2009 1:48 PM
> To: Barry Seib
> Cc: DetomasoList; Thomas Tornblom; Tomas Gunnarsson; Charles McCall
> Subject: Re: [DeTomaso] Busted Big, but Reno anyway? - cams and oil with
> ZDDP - LONG
> 
> 
> Barry Seib skrev:
>>  Guys
>>
>> I have researched this lately and here's what I think I know:
>>
>> If the oil you are buying has an API designation "SM" you should NOT use
> it
>> in any flat tappet engine. It probably isn't real good for old style
> rocker
>> arms and wrist pins either, but it is perfect for catalytic convertors.
>>
>> API designation "SL" is NOT much better and I wouldn't use it in any flat
>> tappet engine either. If either of these designations appear on the oil
> you
>> are considering, whether it's diesel oil, synthetic oil or both, I think
> you
>> are taking a serious risk of premature failure.
> 
> The 20l container of Mobil 1 5W-50 I have in the garage says "API
> SJ/SL/SM/CF". What does that imply?
> 
> Thomas
> 
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-- 
Real life:   Thomas Törnblom             Email:  Thomas.Tornblom at Hax.SE
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