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The reformulation of oils has to with Direct Injected Engines and the altering of the detergent package in the oil to address the ongoing LSPI issues.
"LSPI is an abnormal combustion event in which the fuel-air mixture ignites before intended, causing excessive pressures inside the engine's cylinders." Wasn't this called engine knock at one time?
Let me understand, direct-injected engines time the deposition of fuel in the cylinders directly allowing for an engine with greater timing advance and compression, making more power but now proving to not be immune to fuel preignition, go figure,
Andy
With no ability to wash the intake valves like our PFI 993's. Unless the vehicle has combined both DI and PFI to alleviate the DI issue which some manufactures have gone to. The F150 with 2.7 TT now has such.
Interesting comment on the Motul formulation change. As the shop I go to, RMG in Sunnyvale, said he switched to Motul because Mobil1 changed it formula. This was just last year that RMG informed me of the switched.
As such Im running Motul 4100 in my 993
Here is Mobil's Product Guide sheet from Feb 2018 vs May 2022. For Mobil-1 15W-50 (which is the weight I use), both Phosphorous and Zinc levels are the same between 2018 and 2022. The 2022 guide mentions SN Plus approval, which is new. I don't look at the other weights as I don't use them.
For the heck of it, I went to the Mobil 1 site and use their "Find the right oil for your vehicle" search function. The top matches (based on a 1995 911, over 75,000 miles) are the Full Synthetic High Mileage, Extended Performance, and ESP 5W-30 oils.
Each of these has a nominal zinc level of 900 ppm.
Hello, you may wish to be cautious w.r.t. using Mobil-1 Extended Performance 5W-30 and 10W-30 oils. Indeed after having the same amount of Phosphorous and Zinc from 2009-2019, you can see they reformulated these and dropped the amounts from 800/900 to 760/830 in 2022.
Last edited by Jlaa; 02-16-2023 at 05:57 PM.
Reason: attachments
I use this because it's what the engine builder told me to. I've always avoided this debate and listened to the guy who assembled the thing. Take that for what you will.
Motul 100273 4100 Power 15W-50 Semi-Synthetic Motor Oil
Motul user here, but 993 now gone after 17 wonderful years. My 80-year-old knees curtailed my driving, but I still come back here to see what is happening with my huge favorite of 7 Porsches in 50 years of ownership (and to check out Gbos1's avatars).
Considering a Motul for my wife's new GR86 but I use Joe Gibbs Racing Driven GP-1 after talking at length to the LN Engineering guys. Change twice a year, only drive the car about 2x per week.
02-04-2023, 02:32 AM
