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"! |
Why will u want to get a tune up if ur getting 180mile to 1/4? LOL
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Thanks for your comments, Would you recommend 10w-40 for the summer? and 5w-30 for winter? It's going to get 90f+ in my part of the world.
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Originally Posted by Everest^
(Post 4263580)
Thanks for your comments, Would you recommend 10w-40 for the summer? and 5w-30 for winter? It's going to get 90f+ in my part of the world.
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. |
220f? goddam and i thought 200f was hi. I'll switch to 5w-30 went my next service is due.
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I see 220 oil temps regularly if I beat on my greddy turbo for 5 mins straight ... time for FC oil cooler add-in :P
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Originally Posted by Everest^
(Post 4263576)
Why will u want to get a tune up if ur getting 180mile to 1/4? LOL
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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.
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Originally Posted by stinksause
(Post 4263602)
I see 220 oil temps regularly if I beat on my greddy turbo for 5 mins straight ... time for FC oil cooler add-in :P
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 |
Originally Posted by 9krpmrx8
(Post 4264092)
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.
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. |
As far as the low pressure reading it could be the sending unit (sensor) and not the gauge it self. Just a thought.
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Originally Posted by Bladecutter
(Post 4264132)
Yet both were still just as dead.
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. 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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