Oil pressure
#26
Gas is cheap, engines are expensive. The amount of savings you would garner from a 5w-20 motor oil are not going to outweigh any potential long term issues you might have.
I would imagine the primary issue with using 5w-20 would be longer change intervals where fine material getting passed by the filter could slowly grind away at your bearings because of the thinner oil film. That said, we at BHR have yet to see a rash of engine failures brought about by bearing wear.
I would bump up to a 5w-30 since that is the suggested viscosity for the rest of the world via Mazda. It has long been believed the 5w-20 was used to squeeze some extra MPG figures for sales and to combat the reputation of being an inefficient motor.
I suppose a few of your heads would explode knowing I use a 2-stoke OMP injection oil with a cSt of 7.5 @ 100 degrees Celsius (bottom of the 5w-20 scale) and my housing clearances were well within spec when the motor came apart after 100,000 overall miles with about 40,000 of them using the Sohn adapter.
Argue on "experts"!
I would imagine the primary issue with using 5w-20 would be longer change intervals where fine material getting passed by the filter could slowly grind away at your bearings because of the thinner oil film. That said, we at BHR have yet to see a rash of engine failures brought about by bearing wear.
I would bump up to a 5w-30 since that is the suggested viscosity for the rest of the world via Mazda. It has long been believed the 5w-20 was used to squeeze some extra MPG figures for sales and to combat the reputation of being an inefficient motor.
I suppose a few of your heads would explode knowing I use a 2-stoke OMP injection oil with a cSt of 7.5 @ 100 degrees Celsius (bottom of the 5w-20 scale) and my housing clearances were well within spec when the motor came apart after 100,000 overall miles with about 40,000 of them using the Sohn adapter.
Argue on "experts"!
#29
Even here in Arizona, I don't often see oil temperatures above 220 degrees in the summer and it usually takes ambient temps of 110 to 115 to make that happen.
There is a wealth of oil information on this site so read through it and you'll better understand what information you need to have to make an educated oil decision.
#33
SARX Legend
iTrader: (46)
Well, Houstonrx8er and I both had between 30k-40k on our Mazda Remans when they died, both were driven hard and meticulously maintained. He used Castrol 5W-20 and I used Mobil1 0W-40. His bearings were toast, mine were in great condition.
#34
Registered
for 5-10 min in the Canyons I typically reach 210-215F.
And I have installed a second oil cooler too.
10-40 Castrol!! ftw
#35
Rockie Mountain Newbie
Does that make your engine the better crappy engine?
What was the cause of failure for both engines? (I don't have your stories memorized, so that's an actual question)
BC.
#37
SARX Legend
iTrader: (46)
Houston's died of a loss of compression and he ended up needing new housings, bearings, etc. His bearing wear likely aided in the premature death of his engine. Excessive bearing wear throws off the balance of the rotating assembly.
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