10w - 30sb in my car??
 

PIcked up my car from the Mazda Dealer last Sunday and today I noticed that the oil in it says 10w-30sb I will assume the sb is synthetic blend? but why the 10w-30? because we are in florida with all the heat?? I know this sounds stupid but newbie 8 owner here :Wconfused :Wconfused

Don't worry about it. It's fine.

for rx7 , owners usually use 20w-50 in hot weather because the oil is thick and is more resistant to break down. in cold weather, they use 10w-30 which is thinner because in cold , obviously oil doesnt' break down easily. for n/a cars like rx8, it doesnt' really matter..

thanks Rotary god...but am I correct the SB stands for synthetic blend?

thank you evilblade as well, I am so new to this car I am used to working on race bikes

It could stand for that. Who knows what terms dealers use?

Just remember that when your car is running and fully warmed up, it is always running at the higher viscosity number. A straight 30W, a 5W30, and a 10W30 are all the same when the engine is warmed up. They are only the lower number (if present) in very cold weather. A 5W30 would be better in cold weather than a 10W30. The older rotaries always ran higher weight oils while the Renesis is made for the lower weight oils. In truth there is nothing different between them that should make one engine any more receptive to a lighter weight oil than the other. It's more of a trend now days that lighter oils are used. They still do their job and they take less power to move around. I like a lighter oil in a rotary because it is easier to move around inside the engine. The oil serves as a coolant for the rotors. I want this to flow nice and easily so heat gets rejected faster. 5W20, 5W30, 10W30. Don't worry about any of them. It's fine. I use full synthetic btw. Royal Purple 5W20.

i use 5w20 like the manual says.. i love in so cal, and was wondering wat u would recommend for summer (80C-100C) and winter (40C 50C)???

wow, look at the date !

if its really 100C in so cal u be dead by now. (C = Celsius)

Use 10w40, then u're set.

Reviving the dead.

lol fuhhh thats wat i meant... holy balls i cant believe i did that... yea Fahrenheit :0

yeah i know old thread, but id rather search than be flamed...like the many other times...

Now you're getting flamed for searching!

yup, so 10w40 all year round?

Use a 20 weight for fuel economy, 30 weight for middle ground, 40 weight for the worst fuel economy.

Use a 20 weight for the least resistance to heat, 30 weight for middle ground, 40 weight for the most resistance to heat.

Use a 0wXX in northern Canada, 5wXX in most of North America, 10wXX in the desert.

Make up your mind from there.