pennzoil 5-20

BTW, mobile 1 has this 0W20 but the bottle says recommended for use on Ford & Honda engines for 5w20 or something like that, would that be ok?

Castrol GTX 5W-20

Redline 5W-20

Mobil1 5w-30.

Mobil 1 5w-20

penzoil 5-20

castrol GTX 5w-20

5w-20 (ducking) Castrol

Motorcraft Syn Blend 5w-20

Castrol GTX 5w-20 also.

pennzoil 5w-20

When did that come out? Last I checked, Mobil 1 was only available in 0W-20 or 5W-30, but not in 5W-20.

Shell 10w-20

Castrol-GTX 5W-20

anything wrong with dealership oil?

Its been around for quite some time. A couple years at least.

Only Castrol 5W-20. Our VW Passat has run on Castrol since new 5 years ago. I change it every 5k. Turbo Passats have had problems with clogged oil pumps from oil sludge, 2 of my friends with the same car have had oil pumps fail. VW now recommends synthetic oil. I checked the inside of my oil pan after 70k miles with Castrol and it was perfectly clean. I now use Mobil 1, per VW, but Castrol has never let me down in over 20 years. My Saturn ran on only Castrol and I sold it to a friend when it had 175k miles on it. Didn't burn any oil and ran perfectly. Stick with Castrol and you will do fine.

Castrol Syntec 5W-20, I believe

Synthetic Oil?
 

FIRST - Calm down, I use Castrol GTX 5w-20. :)

SECOND - A buddy once explained to me a strange side effect of synthetic oil. He said that because it lubricated so much better, and had much less friction than normal oil, it took much longer for his car to warm up, so... it took much longer for his heater to warm up. With the anemic heater we have in the 8, I don't think I'd much care for such a side effect.

Has anyone experienced this? Confirm? Falsify? Flame?

BS. If it made that much difference to internal friction, you'd see a significant mileage jump from switching to synthetic - and you don't. I've run synthetics and dino oils in various cars through Canadian prairie winters - and the oil doesn't make a degree of difference to the warm-up or heat output.

Regards,
Gordon

I use whatever the local Mazda dealer uses. . .

My Mobil dealer (last year) said they don't make 5W-20 Mobil 1, and that my Ford van should use the 0W-20 Mobil 1, as it was designed for those vehicles needing 5W-20. I had not heard that they added the 5W-20 viscosity yet.

Also, I just checked the mobil1.com website, and 5W-20 is not listed. Are you talking about a different 5W-20 Mobil oil?

The heat generated by the friction of a few well-lubrucated metal parts sliding together is insignificant compared to the power of The Force. er- I mean - insignificant compared to the heat generated by combustion.

Doesn't the user manual state NOT to use Synthetic oils? The RX-8 actually burns oil and I believe I read that synthetics caused problems due to this... please do your car a favor and check w/ Mazda.