StealthTL

iTrader: (1)

I think you didn't do QUITE enough 'research'......

S

Jim Chen

Why does the owner's manual recommend mineral and not synthetic? I'm the guy who continues to have problems with the engine stalling after hard driving. After changing the oil the problem goes away for awhile but then eventually comes back. No one at Mazda Taiwan has been able to figure the problem out nor have they found the problem. Guys here say it's carbon build up or lack of compression. You think the motoroil has to do with my problem? Is my engine operating too hot, even though the temp guage shows normal temp.

Flashwing

Mazda doesn't suggest the use of synthetic oil because it's not been tested to ensure there won't be any major carbon buildup. No two synthetic oils are a like while many mineral oil types share similar elements.

Synthetic oil typically has stronger bonds than mineral oil so it doesn't burn quite as well. Still, many owners have ran synthetic oil without any problems.

Oil, sadly, is a very individual choice much like various other elements when it comes to cars. People have good and bad experiences with every single brand of oil on the market. The best is to use what you feel is right for your car. You'll get 100 different people giving 100 different opinions.

I suggest do your research and make up your own mind. That's the easiest answer I can give.

Nubo

Mine has no such recommendation.

Old Rotor

This is what is in my Mazda Manual....so not a problem...I had to show the Mazda-mech and thats all he needed. Some of us should be running 10X40wt or even 20X50wt in hot climates.

"Engine oil viscosity, or thickness, has an
effect on fuel economy and cold-weather
operation (starting and oil flow).
Low-viscosity engine oils can provide
improved fuel economy and cold-weather
performance.
But high-temperature weather conditions
require higher-viscosity engine oils for
satisfactory lubrication"

NgoRX8

iTrader: (1)

theres quite a few threads on this debate. switch to 5w30, that's what mazda recommends in rx8s in every other country. don't take my word for it, research more.

nycgps

iTrader: (1)

The problem is that Mazda made compromise on Renesis, first is that they "thought" 2 oil injector is "enough". Turned out to be a "TOTAL" mistake.

Second is that they have to meet emission standards, injecting too much oil will "fail" them right away.

Just look at the 09, 3 injectors plus a new OMP system. That should tell all of you something.

Plus, the 5w-20 is another compromise. they need to squeeze every single bit of MPG out. who cares about the Engine's longevity ! Most people dump their cars within 60K miles anyway ! (not me tho, Im gonna keep my car till the end of the world!)

Conundrum

iTrader: (1)

What page and year is that on in the manual?

Edit: Nevermind, Found it, 2004 manual, page 8-9. But those wording has been removed since 2005 manual.

LionZoo

I would guess your seals are wearing and you'll need a new engine in the future. With fresh oil it's just thick enough to maintain the needed compression, but as your oil ages, it probably shears or thins and so becomes not quite thick enough for your engine and so you end up stalling. That's my guess anyway.

Jim Chen

LionZoo...is there any way to repair the seals on the engine? I think your comments are right since it seems reasonable. You think if I get the Engine replaced I shouldn't have this problem anymore? How much would a new engine cost me?