MoC2S said:I thought this was the 993 forum, why are we arguing about the right oil for 356s ? And 'friction type valve gear' applies to pretty much all motors with a camshaft or two ad infinitum ..
For those now competely confused, the Porsche Classic oil is available as follows (from the brochure so not fake news [:-]): reading spectacles are quite cheap these days ... [][&:][8D]
20W-50 for 356, 914 and early
911 models.
For all 356, 914 and 911 models
(up to the 2.7-litre G model),
Porsche recommends the multigrade
version with viscosity
20W-50.
Whether the engine is hot or
cold, this oil ensures ideal care
for the classical engine, with
minimum sediment and excellent
compatibility with the materials
used, such as cork seals or
bearing shells containing lead.
20W-50, 1 litre
Part no.: 00004320928
20W-50, 5 litres
Part no.: 00004320929
10W-60 for 911 models with a
displacement of 3.0 litres or
more.
From 3.0-litre engines with drysump
lubrication upwards, the
air-cooled six-cylinder flat
engines of the 911 are suitable
for use with fully synthetic oil and
thus benefit from the advances in
oil development technology.
Porsche Classic provides ideal
protection for the engine and
keeps it clean – both with cold
starts or with a hot engine at full
load.
10W-60, 1 litre
Part no.: 00004320930
10W-60, 5 litres
Part no.: 00004320931
I guess they forgot the 912 existed, or maybe its not considered a Classic (ducks for cover) .. [8|]
I ran Mobil One 0W 40 for many years without any issues, and as I said before, Porsche Classic and Porsche AGs Oil Approvals differ on the topic. The 993 engine is a specific case where a low cold viscosity full synthetic is desirable and should not cause leaks. If your engine is really tired and worn, maybe go with 10w 60 to help keep hot oil pressure up but be prepared for the tappets to take some time to pump up from cold. And make sure it's still fully synthetic ! A good 10W 60 is available as Castrol Edge (approved for BMW M Sport engines), but if you ask Castrol for a recommendation, it comes out with Edge 5w 40, which is .. drum roll .. the Porsche Approved Oil !
I suggest you use your common sense. I have written on this topic so many times over the years, and now it is Porsche Classic muddying the waters, aided and abetted by inaccurate reading and pronouncement. I despair !
Love your 993, cheers, Maurice
MoC2S said:Modern engine !! David, that article is about modifying Detroit pushrod OHV engines .. if you start with a single camshaft in the V of the engine block, then use long bendy pushrods to drive rocker arms and (eventually) vertical valves in a non optimal combustion chamber, there is a lot of friction, reciprocating mass and timing inaccuracy to lose !
While the air cooled 911 engine is one of Hans Mezger's designs, it does not pretend to be state of the art. The design is more for a compact package of high build quality, excellent reliability and driveability. But definitely rather more advanced than the designs you are quoting as 'the modern engine'.
All 993s came filled with Mobil One 0W 40 ('modern low viscosity high suds oil') from the factory in the 90s, so I can only assume Porsche Classic have done their own research based on requirements for the current ageing fleet. So not a question of what the engine materials, tolerances, bearings, gaskets etc were originally designed for, rather the worn higher mileage engines with warped cam covers. I'm not sure they are correct to bracket the 993 engine into aircooled 3 litre or more, as there is a distinct difference with the introduction of those terribly modern hydraulic valve actuators.
I would rather discussions on this forum were fact-based, myself. Opinions based on internet myths or inability to read are not particularly welcome ! [8|]
Love your 993, cheers, Maurice [&:][
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