Michael,
I've used Mobil 1 5W-30 for years in my U20 engine with no problem, but that
rear main rope seal is an antiquated design and very difficult to make it seal
100%. However, within the last few years, most motor oils have reduced or
eliminated the zinc/phosphorous additive, ZDDP (necessary for good lubrication
for the U20 and R16 engines' cams due to there flat tappet design). Most
modern oils have reduced or eliminated this additive to prevent
contamination/poisoning of the catalytic converter (not a concern for a
roadster unless you've added a cat). See this article:
http://www.aa1car.com/library/motor_oil_additives.htm
There are plenty of other articles on the web if you google "flat tappet ZDDP".
Mobil has a web page on it too, and Mobil 1 5W-30 has reduced or eliminated
the ZDDP. There are other Mobil 1 oils that still have the ZDDP, but they're
heavier viscosity oils. There are oils and additives out there that still have
ZDDP additive, such as the synthetic Redline 5W-30 High Performance Oil, which
is what I'm using now.
Gary
From: Michael Knorr <mhknorr@msn.com>
To: Datsun Roadster Listserver <datsun-roadsters@autox.team.net>
Sent: Friday, September 11, 2009 3:23:33 PM
Subject: [Roadsters] Another Thread on Synthetic Oils
What are the problems with Mobil 1? What are listers' recommendations for
synthetics, and where does one buy them? I originally bought Mobil 1 because
my parts store had gallons of the stuff, it's been around for years, and I
don't worry about it losing viscosity when my car sits in storage all winter
-- yeah, I can't wait to move back to the West Coast. Any and all help is
appreciated.
Regards, Michael Knorr
1966 SPL311-03639
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