10w30 to 5w30

Ndx

Messages
1,875
Location
IL
Hi Guys, I have old EU version 1.6L Mazda For past 15 years 10w30 was used I wonder if its safe to start using 5w30 or maybe 0w30 even or 0w40 ? Any opinions ? Thank You in advance.
 
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Messages
39,812
Location
Great Lakes
Probably either one of those would work, although when you go for 0w-30 or 0w-40, you're talking synthetic oil, which will cost you more. Depending on the OCI, this may or may not be overkill.
 
Messages
8,711
Location
Nothern USA
I switched from the specified 10W-30 for my 77 Chevy LUV to 5W-30 in the mid 90's. The only difference I have noticed is easier cold starts. Hummmmm, maybe the current starter motor has lasted longer than the original. I figure the current 5W-30's are much better than what was available in 1977 and we have much more experience with thinner oil now than then.
 
Messages
3,118
Location
San Antonio, TX
Ndx, do you think you can find a 5w-30 that does not thin down to a 20wt? Some members down here used dream of getting their hands on some of the 0w-30 fleet oil ya'll have in Canada. I think it's Esso. My guess is it would be better for your Mazda than conventional 5w-30 passenger car oil.
 
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