[DML] Re: Yet Another Oil Thread

["content22207" <brobertson@xxxxxxxxxxxx>]

In 1985 Volvo issued a service bulletin substituting 10W30 for the
10W40 spec previously used in owner's manuals for B27 and B28 equipped
automobiles. Heavier oil wasn't circulating properly, leading to
premature camshaft wear. This is BTW the only official word from Volvo
regarding PRV camshaft problems (in contrast to the "soft B27
camshaft" rumor prevalent in the DeLorean community).

That same bulletin upgraded all PRV's to API grade SF oil.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "Dave Swingle" <swingle@xxxx> wrote:
> When in doubt, read the owner's manual. Paraphrased from the second 
> version manual, although I recall the specs to be similar in the 
> first one:
> 
>    Based on outdoor temperature when operating:
>    Always above 20C (64F) - 20W50
> 
>    Between -20C and 40C (2F and 102F) - 10W20, 10W30, 10W40, 20W40.
> 
>    Below -20C (-2F) 5W20, 5W30. NOTE: This Oil Should Not be used 
> when temperature is continuously above 0C (32F).
> 
> I'm always surprised how many people are using 5W30 in their car, 
> only because that's whats used in most modern cars. 
> 
> This heavy oil spec is not as unusual as you may think - Other Euro 
> cars of the era have similar specs. I work with older BMWs and their 
> recommendations are very close to this. 
> 
> Many of the above weights are no longer sold.  A really nice 
> compromise is Mobil 1 15W50 Synthetic - a bit pricey but after 
> recently taking apart a 170,000 mile BMW engine that ran this stuff 
> I'm a believer. Comes in 5-quart jugs at WalMart.
> 
> Dave S




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