Which Type of Oil?
Which Type of Oil?
12-13-02, 01:34 AM
#3
OBEY YOUR MAZDA
I was told only to use mineral-oil in my n/a and rotary in general, I use only high quality oils just to be safe.
Supposedly synthetics leave more deposits when burnt, correct me if im wrong.
Supposedly synthetics leave more deposits when burnt, correct me if im wrong.
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12-13-02, 09:57 AM
#12
Rotorhead
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Although I also use Castrol 20w50, I would like to point out a few things:
1) Synthetic oil has been used in rotary engines with good results for many years, especially in racing. While synthetic oil is superior, I hardly think that it is worth paying $8/qt x 5qts every 3,000 miles for a regular street-driven car. Some brands of synthetic oil WILL ruin your rotor housings, which is why Mazda recommended against using synthetic oil in general. If in doubt, ask the synthetic oil manufacturer.
2) While heavier oil tends to protect better at high temperatures, it also causes more engine wear at lower temperatures. I think that 10w30 may be a better choice for the weather in Seattle this time of year. See the owner's manual or Factory Service Manual for oil temperature ranges, but note that the 10w40 and 10w50 grades tend to break down quickly, so many people avoid these weights.
1) Synthetic oil has been used in rotary engines with good results for many years, especially in racing. While synthetic oil is superior, I hardly think that it is worth paying $8/qt x 5qts every 3,000 miles for a regular street-driven car. Some brands of synthetic oil WILL ruin your rotor housings, which is why Mazda recommended against using synthetic oil in general. If in doubt, ask the synthetic oil manufacturer.
2) While heavier oil tends to protect better at high temperatures, it also causes more engine wear at lower temperatures. I think that 10w30 may be a better choice for the weather in Seattle this time of year. See the owner's manual or Factory Service Manual for oil temperature ranges, but note that the 10w40 and 10w50 grades tend to break down quickly, so many people avoid these weights.
12-13-02, 11:36 AM
#13
Shelby Tuner & FC badass
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I agree, should never run anything thicker than 10-30 Castrol.
There is no reason to run the thicker stuff, if you feel the oil wears out to fast, just change it, its only $8 with filter...
Also thicker oil will cause alot more wear on a cold engine start than 10-30...
There is no reason to run the thicker stuff, if you feel the oil wears out to fast, just change it, its only $8 with filter...
Also thicker oil will cause alot more wear on a cold engine start than 10-30...
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