Texas Heat? 10w40?
#5
2004 RX8 Engine #2
There is a lot of info in this forum regarding oil, read up and see what you think. You might consider going with the RX8 owner's manual recommendation of 5W20 until warranty on engine has expired. I think the rest of the world recommendation is 5W30 so that might be OK. Many favor a heaver oil like 0W40 synthetic or even 20W50 dino. Whatever you decide check the level often and change the oil often.
#6
RX-Heaven
iTrader: (6)
i run 10W40 in the summer and 10W30 when it gets colder. 38K miles and no issues. not that its completely relevant, but the first and second generation RX-7 uses 20W50 in the summer and 10W40 in the winter months.
#7
I HATE SPEEDBUMPS!
#9
0w40 is about the same thickness as 10w30 at 20-30-deg f, and 40 weight in the summer, thus no going back and forth.
#10
Registered
There is a chart from the Australian RX-8 owner's manual that ASH8 first posted here, and which has been reposted several times. It shows recommended oil weights for various temperatures. For weather like you usually have in Texas this time of year (lows above freezing, highs not tropical) Wingznut's answer is correct.
Try searching for that chart. I've lost track of which threads it appeared in. One of the oil threads, but that doesn't narrow it down.
Ken
Try searching for that chart. I've lost track of which threads it appeared in. One of the oil threads, but that doesn't narrow it down.
Ken
#11
I recommend a 10w40 or 20w50 on all my rebuilds due to the wear on the main bearings I have seen w/ a 5w20 Mazda recommendation and my past experiences w/ these motors.
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09-27-2015 07:38 PM