Tom,
As a one-time AmsOil dealer I can tell you that AmsOil will clean your
engine right out, including the crud in the ring lands. I am not sure you
want that type of performance from your engine oil at this stage of your
engines life. It would clean out all of the varnish holding the valve
guides and ??? together as well.
I don't know what the detergent effects of Redline, Castrol, Mobile 1
(paraffin based, so it is unlikely to clean things out as well), or any of
the newer synthetics might be.
I would not suggest synthetic for a higher mileage engine, but if you
rebuild you should certainly consider synthetic. AmsOil makes a
parasynthetic (partial) oil that is for breaking in a new engine up to 7500
miles, then move to full synthetic for maximum engine life. That will be
the plan when I finally rebuild the U20 hanging on my engine stand.
Tom
69 2000, Mr. Hyde
Portland
http://www.datsun2000.com
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Tom PRATHER
Sent: Thursday, April 07, 2005 10:13 PM
To: datsun-roadsters@autox.team.ne roadster list
Subject: Oil choices for hi mi SRL's
Hi listers,
Just a quick question to all the wise fans out there. My U20 has exibited
signs of worn valve seals since I purchased the car many years ago. Due to
the fact that it shows good compression evenly and it runs so good I have
put off the replacement for years. For years I was running Castrol 20/50 and
as of recently switched to hi mileage 20/50 which seems to be slowing down
the oil burn off. Not so much of the puffy blue smoke on take off. Do you
think switching to synthetic will improve the burn off properties any more?
Thanks, Tom Prather 69/2.0
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