10 replies to this topic

[mr.x]

My Mpi lives in a hot humid tropical climate (20°-35°C+/- ambient/60-100% relative humidity).

 

I have been successfully running the engine/transmission on conventional 20W-50 oil for several years at the recommendation of other forums. The car is a once per month weekend runabout and not a daily driver any more, normally covering under 100 Mi/160 Km per year with a total odometer reading of 28,000 Mi/45,000 Km. I have fitted an air conditioning system and high performance exhaust/cat converter to the vehicle which adds/reduces engine load.

 

With this information would you recommend continuing to run on 20W-50 or switching to a different viscosity?

 

[nicklouse]

i would still run a 20-50 with a suitably high ZDDP package 

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[pete l]

Does that mean that 5w/50 is the best ????

[mini13]

in theory, but the additives that give the wide range of viscosity dont last that long,

 

I would say stick with a good 20w50 unless you get very cold ( read arctic) mornings, if you are in really hot conditions, a 20w60 could be worth considering, but to be honest i doubt theres one with the correct zddp package.

[mr.x]

So I've been using 20W-50 that specifies:

 

"High zinc/phosphorus for anti-wear protection, including push-rod & flat tappet applications"

 

Which sounds perfect from what you are describing.

[mini13]

yep that sounds good, what brand?

[mr.x]

Valvoline

[nicklouse]

very popular choice. VR1

[mr.x]

very popular choice. VR1

Yes, VR1

[brivinci]

Thats what I run (VR1) and it now clearly states it meets the demand for I ZDDP needed in flat tappet motors like ours.

[nicklouse]

but most of us run it for the gearbox.