An equally important specification is the HTHS (high temperature high shear). For the factory Pennzoil 5w-40, it is 3.6, so one would want to at least match or exceed this.
I put in what is in the manual. There is no secret oil that everyone is using that no one wants to fill those "not in the know" in on, I don't think at least.
BTW, I think the reason your owners manual may state 10w-40, is that was the original spec at release. It changed during production, as I know my 97 F355 spider specifically stated Shell Helix Ultra 5w-40 (Pennzoil is owned by Shell), both on a plate in the engine compartment, as well as in the document pouch. That recommendation was applied to all Ferraris that previously specified a 10w-40, as I know my local dealer would use it in 348s that spec'd 10w-40. Again, little negative to that, still 40 weight, just thinner at cold start, so better lubrication to the valve train when cold. This webpage has a copy of the 1998 355 owners manual with the Shell 5w-40 recommendation http://www.**********.com/Downloads/Ferrari_1998_355_Oil-Change-Procedure_REV003.pdf the edited portions are "s t i c k y r x r s" no spaces
Because Z-Rod is not available in Malaysia. Otherwise, the Premium Protection ZDDP content is already very good.
While at Sam's Club today I noticed that they had Mobil 1 5w20 on sale. But it is an unusual blend for me so I looked it up when I returned home. Seems to be an ok blend for my [348] driving style and location (infrequent use, rarely at redline and very hot outside temps). Any thoughts on 5w20? https://www.mobil.com/en/lubricants/for-personal-vehicles/our-products/products/mobil-1-5w-20/ Then I did a search for ZDDP at the Mobil website, see the answer below. https://www.mobil.com/en/lubricants/for-personal-vehicles/auto-care/all-about-oil/ask-our-auto-experts/mixing-motor-oil-to-reach-the-right-zddp-level-for-classic-cars Image Unavailable, Please Login
1. "Mobil 1 5W-20 is a high-performance motor oil for all types of cars where this viscosity is recommended" - this viscosity is not recommended for the 348. 2. Generally, with very hot outside temps, you go for higher viscosity (higher second number) oil, not for lower. 3. In any case, this oil has also rather low ZDDP - not very good for flat tappet engines.
Thanks Miroljub, succinct information as always. My car had its full service back in 2016 and it has never leaked a drop. Low viscosity oils concern me.
1200-1300 ppm ZDDP is desired. Redline and Zrod are there. Another similar post regarding Zrod. https://www.ferrarichat.com/forum/threads/348-and-others-engine-oil.597318/
I think the Amsoil ZROD 10W-40 is the one I am going to go with. I never liked how watery the oil is when I change it and I don't have cats, so might as well get the zinc. Oh and I am not running the car in cold climates so I don't think I really need the 5w. Or am I crazy?
Motul does not publish the ZDDP content of its oils. There are two versions of 300V 10W-40, motorcycle and cars. The motorcycle (4T) version has pretty high ZDDP - Phosphorus 1547 ppm, Zinc 1724 ppm (information I found on the net, not official by Motul); this would be too high for a CAT engines. I can see that there are currently two versions of the car engine 300V oils: 300V Chrono 10W-40 and 300V Power 5W-40 but they are both specified for race car engines. I have no info on their ZDDP. The question is whether they are also suitable for road going engines where the oil change intervals are longer. However, I have some oil test results from 2007 for 300V 5W-40. The word "Power" is not mentioned so this oil from 2007 may be different from the current "Power 5W-40". The test results (attached) show ZDDP of about 1300-1500 Phosphorus-Zinc. This was on a road going car (Audi 2.7 V6 Twin Turbo) and the tests were made after some 6,000 to 10,000 miles of oil use. Image Unavailable, Please Login
Good info, unfortunately without a more recent sample, there is no telling what may have changed in the intervening 13 years. I watch the new and used oil analysis on bobistheoilguy and seems oils can significantly change due to reformulation as frequently as 4 to 5 years. I would imagine there must be changes after that long an interval.
Well, I prefer to go with oils for which official manufacturer's datasheets are available showing the ZDDP content as well as other important info. Amsoil Z-Rod 10W-40 appears to be right at the top looking at the following: 1. Not a racing only oil but specified "for classic and high-performance vehicles" 2. Phosphorus 1320, Zinc 1440 3. High-Temperature/High-Shear Viscosity (HTHS) 4.3 4. Flash Point 242 C (468 F)
Appears to be a racing oil - "suitable for fast road/street modified engines, race, rally, sprints and hill climbs" and "Formulated for high revving engines used in circuit racing or for larger engines for short duration i.e. hill climbs and sprints". No info on ZDDP or HTHS. Lower Flash Point (224C) as compared, for example, with the Amsoil's 242C. Probably not suitable for a road going car (unless you change it every ~500 miles).
Hi Everyone, I had some virgin Pakelo Krypton oil analyzed as the particulars, like zinc content, aren't available. Long story short, this looks to be like good oil for a modern car BUT the zinc content is a deal breaker for me. Unfortunately modern day emission standards don't support high zinc content. Image Unavailable, Please Login
