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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 55,873
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High "moly" content oils for modern p-car engines not ZDDP
This came out of the PCA video on bore scoring. I know we're all familiar with the whole "oil should have ZDDP" thing. Apparently, in many/most of the modern Porsche motors, ZDDP is not particularly helpful/useful because the bores and pistons aren't ferrous. (I'm not sure if that applies to the wear pads on the piston skirts) According to the video, what boxsters, caymans, cayennes, macans, etc... need are high "moly" content oils.
It's been a bit since I watched the videos, but I remember 2 names coming up, Liquimoly (specifically the ceratec oil treatment), and Driven (DT40 & DI40). I remember the statement being made that not all liquimoly oils have high moly content. It's interesting that the DI40 is specifically for vehicles with Direct Injection. Liquimoly ceratec - https://www.liqui-moly.com/en/us/cera-tec-p000017.html Driven DT oils - https://drivenracingoil.com/c-1389359-shop-by-product-street-performance-oils.html Driven DI oils - https://drivenracingoil.com/c-1389348-shop-by-product-direct-injection-oils.html Anyone using any of these?
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
Last edited by masraum; 07-22-2024 at 11:59 AM.. |
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07-22-2024, 11:55 AM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,076
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After a long study on P scoring the net results from many various sources is to move over to a good 5W30.
It will prolong the misery. The ZDDP is a good package for flat lifter cars, but does not do much for the skirts banging on the lower cylinder walls.
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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07-22-2024, 06:41 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 55,873
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The videos (there are 4, linked below) were really interesting.
If the folks in the video say that moly heavy oils help, I'm game. They also said that you should not let a cold car sit and idle (mostly targeted at sub-freezing environments), and you should also drive a car and get it up to temp before hammering it, and explained why those things were important. The various scientific tidbits in the video about the specifics of the pistons, cylinders, and materials were really interesting and informative. Apparently, ZDDP will "bond" with ferrous surfaces but not Al. But moly will form a protective coating on Al. They also recommend going with shorter oil change intervals than the factory recommends. I probably need to get an oil analysis done. I wish I'd seen the videos years ago. What I also found very interesting was that these issues impact pretty much all of the modern Porsche engines including the Macan and Cayenne are impacted. Motors with forged pistons are especially impacted (S model coxsters more than base models).
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa SOLD 2004 - gone but not forgotten
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07-23-2024, 03:55 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,076
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Also, if not stated, the correct oil is essential with direct injection application to avoid low-speed knock.
The trouble is several different markings prove if usable in the situation. Amsoil uses AI as the abbreviation. There are several more for other brands. Supposedly the GM test is a very high standard. IDK if true or not.
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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07-23-2024, 04:55 PM
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