Carpokes Porsche Forum

The Liqiu Moly was something I was trying on my Toyota Highlander that had lifter noise after a short oil starvation incident and it helped significantly. Thought I would try it on the 944 since the lifters were somewhat noisy (which seems to be a common problem). After your question I searched regarding ZDDP content in different oils. There are a several that have a lot more than VR1. Here is a link to a chart that one online retailer put together
https://static.speedwaymotors.com/image ... YwJGwwJGgw

They also have an article that has several links to research papers on how ZDDP works

https://www.speedwaymotors.com/the-tool ... kcn2PdN4_2

This info make me think about trying some other higher ZDDP oils to see if there is a practical difference.

Speedwaymotors is just down the road from me in Lincoln, Nebraska and they are often considered America's Oldest Speed Shop, founded in 1952. They do research things well since they cover a very broad range of racing, track and performance venues. I know quite a few friends who run Liqiu Moly and they advertise usage in Porsches.

Off the subject, if every traveling across I-80 and you have time stop at the American Museum of Speed right next to Speedway Motors in Lincoln. It is often considered the best racing and speed related Museum in the US --- when you think you have seen it all you find out there are two more floors. One could literally stay an entire day and not view everything.

FWIW, I'm using Motul 4100 Power 15W-50. This is from the shop I used when I updated my 951 after little usage for several years. One of the primary partners in that shop is a former Brumos race tech who now speciailizes on 911 air cooled so I've gone with what he suggested. No issues thus far.

I run nothing but Mobil 1 15W-50 in all my flat tappet sports cars for the last 25 years. Never had a problem, so I don't change a thing. There were a lot of talks that the formulation changed in 2020 to apease modern catalytic converters. My reasearch says it is still more than adequate. Like they say, if it ain't broke, don't fix it!
My $.02

This is a timely discussion for me as it is oil change time. I've been using Castrol GTX for a long time but do occasionally get lifter tick. I lean toward convention oil just because I change it overly often and synthetic seems to produce leaks that just aren't there with convention oil... I'm thinking about trying this Motul conventional oil. Anyone try it yet?

I searched for a data sheet and came across this data

https://azupim01.motul.com/media/motulD ... 210222.pdf

Looks interesting to me. If you do use it for your next oil change, feedback would be appreciated.

zooklm1 wrote: Fri Aug 01, 2025 6:10 am I searched for a data sheet and came across this data

https://azupim01.motul.com/media/motulD ... 210222.pdf

Looks interesting to me. If you do use it for your next oil change, feedback would be appreciated.

I ordered it. What the heck. Will do an oil analysis with my current oil and with this Motul, and will report back I wanted to try their 'Eighties' oil, but they only sell it in 10-40 and I really wanted to see if the higher zddp would allow me to run 20-50 without the lifters ticking. We shall see.

Just to follow up, I changed the oil this week and used the Motul 20-50 'after 50's' oil shown above. Hard to reach any conclusions without running it a while and doing an oil analysis, but I'm happy to say the lifters are quiet with this oil. They would sometimes tick with Castrol 20-50, so I was running 10-40. On that basis alone, I'm liking it. The 2 liter cans are also convenient because they add up to about 6 and 1/3 quarts, which is almost exactly what I normally add when changing the oil and filter. They also make a satisfying, old school, Wizard of Oz Tin-man oil can sound when pouring.