[Healeys] Oil grade for 100 Le Mans

[richard mayor]

Michael,

I use 20w-50 in all of my classic car engines.  Now, if I drove them in the winter time I would probably consider the 10w-40 option as it would have the lower 10W viscosity for those cold morning start ups.  So you are fine. 

Richard


Richard Mayor
boyracer466 at gmail.com



> On Mar 20, 2022, at 1:50 PM, Michael Salter via Healeys <healeys at autox.team.net> wrote:
> 
> IMHO Michael that will be absolutely no problem. 
> 
> M
> 
> On Sun., Mar. 20, 2022, 4:45 p.m. Michael Oritt via Healeys, <healeys at autox.team.net <mailto:healeys at autox.team.net>> wrote:
> Through a stupid mistake on my part today I purchased eight quarts of 20w50 synthetic Amsoil rather than the 10w40 I normally use year-round.  Unfortunately I discovered this mistake this afternoon only after I completed the oil/filter change.
> 
> I am concerned that this higher-viscosity oil might in some way damage my engine.  It has been about 60-70K miles from the engine's having been professionally rebuilt and while oil pressure has fallen somewhat over the last several years the gauge still indicates about 40 psi at 2500-3K rpm's and about 20 psi at fast idle with 10w40, in both cases with hot oil and at normal engine operating temperature.  I took the car for a very short spin after completing the change and I am quite sure I did not did not get the oil up to full operating temperatures but in any case the OP did seem a few psi higher than what I am used to seeing
> 
> At this point I have about $125.00 invested in the mistake:  seven quarts and a new K&N filter.  If my fear is verified by your opinions I am certainly willing to drain and refill--I certainly do not want to be driving around if there is a real risk of causing damage. 
> 
> I eagerly await the group wisdom.
> 
> Best--Michael Oritt
> 
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