Re: (GrecianVolvo)
Hey Grecian,
First of all, how the heck did you get 10,000 posts!!!
Secondly, I tend to agree on your comments about the 15W50, but I'm interested in any additional info you can provide. Since the 15W50 flows down to temperatures 30-degrees colder than we've ever recorded in Tennessee (we did hit the minus 20 mark about 25 years ago) I don't think the cold flow is the issue. Perhaps the 50 weight part of the formula is too thick. Since 15W50 flows down to colder temperatures than some 5-weight oil, I am puzzled about the "thickness" of a oil that flows that cold. It would appear it has one heck of a film strength, and that might just be too much to push through an oil pump all the time.
Sorry for the rambling, just interested in any more info you have regarding the synthetics. I'm using this oil in the older Porsche cars now, see my post noted below recently received from Amsoil. Now perhaps you can see why I'm wanting to know the best oil for this beautiful new turbo we just bought. Regards, Mr. P
here is my original post to AMSOIL below:
I have three older water cooled Porsche's, presently running Amsoil products, but I want to be sure I'm using the proper (or best) product:
1983 928S 5-speed freshly rebuilt transaxle, 120,000 miles
1984 944 5-speed transaxle, 165,000 miles
1990 944 S2 5-speed transaxle, 88,000 miles
All three cars share the aluminum piston bore, with high silicon content, and all are running in good condition. I am using Series 2000 20W50 in the 928 V8, and will soon go to the Series 2000 75W90 gear lube. The Series 2000 75W90 gear lube made a huge difference in the worn transaxle on the '84 944 with 165,000 miles, it now shifts into second gear much better, and it is more quiet.
QUESTIONS:
1. Is the 20W50 "too thick" for the cars? I like the cold flow of the selection, but I notice your recommendations don't include this oil.
2. With a freshly rebuilt 928 transaxle, would it be better to use the Series 2000 75W90 gear lube, or the Series 2000 75W140 gear lube?
3. With the high milage 944, what is the best oil recommendation, and should I go "up" to the 75W140 gear lube in that transaxle. This particular gets a puff of smoke upon startup if it sits for a week or two, I suspect I'm getting some seepage at valve stems, which is of little concern to me. The transaxle was giving a little noise, some whine, a small "rattle" and difficult shifting when cold to second gear; the Series 2000 75W90 generally fixed this, but I am wondering if I should go to the 75W140. What is the motor oil recommendation for this situation too.
Since the 1990 S2 has relatively low milage, I'm interested in your comments for this car too. It runs and drives "like new" and I want to keep it that way.
Sincerely, and regards, P
From: Mail TechService [mailto:tech@amsoil.com]
Sent: Friday, May 28, 2004 2:01 PM
To: P
Subject: RE: Technical Service Contact Form
To: P
From: AMSOIL Technical Services
Thanks for contacting AMSOIL with your concerns.
In response to your inquiry, the Porsche engines are actually very flexible as to viscosity. I think the 20W50 viscosity is excellent for these engines - especially the older ones. It'd best to stay with the 90 grade gear lube though unless we're dealing with a high wear situation.
Thank you again for the opportunity to respond to your concerns. As always, please feel free to contact us again if we can be of further assistance.
Sincerely,
AMSOIL Technical Services
