Engine Oil for High HP Rotarys 2018. Whats acceptable?
#1
Engine Oil for High HP Rotarys 2018. Whats acceptable?
Numerous threads on here regarding engine oil, but I have seen any updates in recent years. I am aware and have been using the seemingly #1 choice, Castrol GTX 20/50. However, I've not been able to get this locally(outside the US) lately. Also, there are several newer brands on the shelves these days. What else are you guys using in the 20/50 grade that is acceptable for my high HP rotary?
Some of the brands I have access to: Formula Shell, Valvoline Premium, Total, Xcell, Mag1, Coastal, and Tekstar.
What brand are you using?
Some of the brands I have access to: Formula Shell, Valvoline Premium, Total, Xcell, Mag1, Coastal, and Tekstar.
What brand are you using?
#3
Banned. I got OWNED!!!
Uhh, definitely interested here too. I'm thinking along the lines of Rotella T6 5w-40, or if I need more oil pressure I can find a Euro oil equivalent.
#4
Rotary Enthusiast
iTrader: (30)
A long but interesting read: https://540ratblog.wordpress.com/201...-test-ranking/
Tempted to try out the Renewable Lubricants, Bio-SynXtra in 10w-30.
Tempted to try out the Renewable Lubricants, Bio-SynXtra in 10w-30.
#5
Banned. I got OWNED!!!
A long but interesting read: https://540ratblog.wordpress.com/201...-test-ranking/
Tempted to try out the Renewable Lubricants, Bio-SynXtra in 10w-30.
Tempted to try out the Renewable Lubricants, Bio-SynXtra in 10w-30.
#6
Eye In The Sky
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Why not used the oil that was developed for the engine?
20W50 at Idemitsu Lubricants America Corporation
And use their premix in the gas.
20W50 at Idemitsu Lubricants America Corporation
And use their premix in the gas.
#7
Rotary Enthusiast
iTrader: (30)
Read section two of that engineers blog. It discusses oil pressure vs oil flow and points out it's not oil pressure that separates bearing surfaces. Makes sense that we would want maximum flow through bearing surfaces where a thinner oil will always flow better however we must make sure there is enough pressure to keep the bearings fed.
Over the years I would always see the 20w-50 recommendation because of fuel dilution in the rotary. Only proper testing would show if this really is the case in a healthy motor, which I have not come across.
Over the years I would always see the 20w-50 recommendation because of fuel dilution in the rotary. Only proper testing would show if this really is the case in a healthy motor, which I have not come across.
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alexdimen (09-28-18)
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#8
Senior Member
This has to be one of the few questions that are truly difficult to answer as there are too many brands and weights out there. What you should start with is a synthetic oil with a high base stock grade and then narrow your choices through oil tests lab data given through the manufacturer.
Personally, I run Schaeffers 5-50 Supreme 9000 which is considered a racing oil. It has loads of zinc and moly and high lubricity content. Another nice thing about it is that it's known to keep surfaces clean of varnish and help keep your oil system clean. The only problem is that it's hard to get. I've seen higher pressures and slightly cooler temps with the oil since changing from a 20-50. In piston engines, people have seen oil change intervals upwards of 10k miles. My salesman has been sending in tests and changes around 12k.
I would do some research as there's a lot that goes in to good oil and you'll most likely be good with anything you pick.
Personally, I run Schaeffers 5-50 Supreme 9000 which is considered a racing oil. It has loads of zinc and moly and high lubricity content. Another nice thing about it is that it's known to keep surfaces clean of varnish and help keep your oil system clean. The only problem is that it's hard to get. I've seen higher pressures and slightly cooler temps with the oil since changing from a 20-50. In piston engines, people have seen oil change intervals upwards of 10k miles. My salesman has been sending in tests and changes around 12k.
I would do some research as there's a lot that goes in to good oil and you'll most likely be good with anything you pick.
#9
Rotary Freak
iTrader: (22)
I have not try Idemitsu oil but i have use castrol and valveoline and Mobil syentec and I find that Amsoil oil and it out perform all of them. I am hitting close to 2k miles on my amosil synthetic and the oil is stilll like new. I used the turbo signature series 10 w30 or 40 weight can't remember and I dont baby it either.
#10
Lives on the Forum
iTrader: (9)
I happened to have Amsoil available locally, so tried it after Mobil1 seemed to stop selling 20/50 and really like it. Based on the motor oil, I tried their gear oils as well—including their 70/140 weight that I put in the diff to keep it from breaking down and leaking on track until I get a dedicated cooler setup.
#11
It Just Feels Right
iTrader: (11)
Currently i run Motorcraft 5-50, but thinking about Mobil 0W-40 FS (Euro spec)
This
#12
Spin 2 Win
iTrader: (3)
You also have to consider that the "hot" weight is also usually based on an oil temperature of 100C. So if you are racing and your temps are getting higher than 100C (hint: where you measure the temp is important) the oil viscosity will be lower. I usually run a 20w-50 at the track and 10w-40 in my street car. So it really depends on your personal use case but for street use, any SAE oil from any of the major brands will work.
#13
spoon!
A long but interesting read: https://540ratblog.wordpress.com/201...-test-ranking/
Tempted to try out the Renewable Lubricants, Bio-SynXtra in 10w-30.
Tempted to try out the Renewable Lubricants, Bio-SynXtra in 10w-30.
#15
spoon!
In all fairness, his methodology is fine for one specific sort of thing - it does a good job at looking at boundary lubrication. For highly stressed flat tappets like on a BBC drag engine, that's a weak point. For many other things you can actually fail the fluid film bearings.
I'll have to test oil viscosity once I get the engine dyno going. I really really want to try to do some temperature measurements at the rotor bearings on a 13B - I have some strong suspicions.
I'll have to test oil viscosity once I get the engine dyno going. I really really want to try to do some temperature measurements at the rotor bearings on a 13B - I have some strong suspicions.
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