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0W20 vs 5W30

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Robbijay View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Robbijay Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2018 at 12:58pm
I've stuck with 0-20 as most of the time I'm cruising up &down the M5, so the economy is reasonably important. I don't drive it hard for long enough periods of use to worry about heat, but i'd probably switch it out if I FI'd it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Moves With Clouds Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2018 at 1:32pm
Originally posted by nikitopo nikitopo wrote:

Did you guys read the manual carefully?  It doesn't say you MUST use 0w20 oil, it is just recommended ...
 

If the manual says so I'd consider it a good guideline. Even though I suspect 'high speed' is not really that demanding because cooling works well at high speed.
Just keep it pointed in the general direction you want to go
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BRZ Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2018 at 6:37pm
There is more to what the manual says to the right of the graph and also the graph itself has 2 viscosities explained, atleast in the Subaru version. Did not have a rotate image option, so might have to turn your smartphone to see. Smile It gets quite opinionated based on limited hear say, which is why i generally don't get into oil debates... The OP has already got his oil and its a confirmation bias at play here. 


Originally posted by nikitopo nikitopo wrote:

Did you guys read the manual carefully?  It doesn't say you MUST use 0w20 oil, it is just recommended ...
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kodename47 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2018 at 7:38pm
Also the OEM uses fully synthetic. I believe that it's recommended to only use FS and SS.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MJG Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2018 at 9:42pm
Thanks Nikitopo!! This confirms as I thought 0W20 for emissions/economy and higher grade oil for higher load driving. As I've ordered a baffled sump pan you know I'm looking at the latter.

I will be interested to see if has any noticeable effect on the fuel economy.

I doubt temperatures will rise much but if so I can always get an oil cooler.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Deacon Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2018 at 9:57pm
I'm using 0w30 along with an oil cooler for use on track and having a sump baffle fitted shortly. I've blanked the cooler off during winter and have also fitted a higher temp thermostat to the oil cooler sandwich plate. I also have an oil temperature and pressure gauge fitted. This year I'll also swap back to 0w20 around October and again block off the cooler for the winter.
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church View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote church Quote  Post ReplyReply Direct Link To This Post Posted: 12 Mar 2018 at 11:03pm
Hmm. But if there is thermostat .. is blocking off cooler needed?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Deacon Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2018 at 6:50am
Originally posted by church church wrote:

Hmm. But if there is thermostat .. is blocking off cooler needed?


Yes. There is still flow through even with a thermostat.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gavin_T Quote  Post ReplyReply Direct Link To This Post Posted: 13 Mar 2018 at 10:44am
I am still using 0-20 as per Toyota. However as I do a few track days a year I am considering maybe changing next time Ermm
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Post Options Post Options   Thanks (1) Thanks(1)   Quote alex_brewster Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 2018 at 9:07pm
For what it’s worth, I’d strongly advise against semi, semi uses group 1 or 2 baseoils (poorer quality), these are more prone to oxidation and could lead to increased build up of deposits/varnish amongst other things.
Personally I’ll be sticking with the 0W-20 genuine oil, or if track it I may consider a good quality 5W-30 - but I doubt it. Good quality chemistry in a 0W-20 more than makes up for it being thinner and protects against wear.
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