Vlocity

Yes .....to paraphrase (and get flamed) This is the type of imperical testing that proves no failures with 15w-50.

Ken

Mark....I'm just kidding.

chaadster

I'm really surprised to see so many of you guys running 15-50, which is not a Porsche approved oil. They have approved a lot of oils, but not one, single 15-50, and only one SAE50.

Mass hysteria?

Here's a link to the Porsche oil bulletins: http://www.landsharkoz.com/tt/tt_pao.htm

davek9

Me three Big Dave... Mobile1 0w 40 for the past 4 years.

mark kibort

I only use virgin Olive, cold pressed.

mark kibort

tick tick tick.............Booom- splat! unless just street machines.
Do a few hard 6500rpm DE days and then get back to me

mk

Bill51sdr

Geeezzzzzzz... save it for another thread! He said this isn't a debate over the merits of one manufacturer over another

AO

Hey Chaad,

Here's my owner's manual. Sure, it doesn't list 15W-50, but it does list 15W40 and 20W50 as examples of approved oils. FUnny enough, I don't see 0W40.

RicerSchnitzzle

My owners manual states 20w50. That's what I have run so far with no complaints. I use Lucas synthetic because it has a drag race car on the bottle..that makes my car faster. I had to add wheelie bars.

JHowell37

I beg to differ. I'm looking at the owner's manual for my '85 right now and 15W-50 is listed as an approved oil.

davek9

Mark I don't track my car, if I did... I agree, I would go to a higher and most likely a 20w 50 oil for sustained high rev’s that tend to beat the heck out of oil, especially in a dual over head cam eng.
But for everyday usage here in MI (avg temp 65 to 85 in the summer) and a quick flow on start up, it works for me w/o any issues, I get strong oil pressure at idle ~20bar even in traffic or in 95+ temp in Hell last year.
So I see no reason to change unless I want to start pushing it (as in SCed)

Andrew I don’t recall 0w “anything” being available back in ’85 do you? But Porsche is using it in there newer twin turbo’s correct… and they must be seeing similar heat and stress levels too.
But what do I know, I am only a backyard wrench/car nut.

DaveK

JHowell37

There is no 0W-X specified for '85. Porsche is using it in their newer stuff due to EPA regulations, mileage requirements, etc just like everyone else. The newer stuff can get away with it because modern car engines are built with tolerances much tighter then they were just a few years ago. Are the newer engines running 10:1 or 10.5:1 compression? Maybe they're higher, I don't know. Heat is easy to measure, I don't know what would be considered stress on an engine. If you've had success with 0W-40 by all means carry on. Personally, the belief that "what's good today will work just fine on my car built 20+ years ago" could be risky.

ew928

I run whatever Mark K. and Porsche don't approve.
When the motor blows ups. Then I can post it and listen to all the I told you so's.

Mark,
I find peanut oil a lot better than extra virgin. I save the extra virgin for salads and dipping bread in.
Anyone tried Canola?

silbershark

Ernest,

I'm a soap maker, so I consider myself and expert on oils.
Canola provides better 'slip'. Emu oil, while pricey ($200.00 gallon) is best for older, worn engines.

worf928

IRRC, Doug Hillary specifically stated that the specs for 0w-40 Mobil 1 were not sufficient for our 928s?


EDIT: Nevermind - it was the Castrol 5w-40 that Doug didn't like:

https://rennlist.com/forums/showpost...2&postcount=38

Larry928GTS

According to Porsche, their latest approved engine oils list covers all 4, 6, and 8 cylinder engines from 1973 onwards.