5W-20 or 0W-20 Back-Spec
#16
The downside is that it can be too thin and/or shear down too quick compared to a 30 weight and you spin a bearing.
#17
Lexus Test Driver
Thread Starter
I've used 0W-20 (during the winter) in my RX and my ES. Engine ran just as smooth and quiet as 5W-30. I could not see an mpg improvement, but this may have been due to winter blend fuel.
#18
Do you still run 0W20 in winter? What do you run in the summer, 5W20 or...? What brand oil and change interval are you using? THANKS.
#20
Lexus Test Driver
Thread Starter
Anything other than winter I run PP 5W-30 and now PP w/ PP 5W-30 and change every 4500-5000 miles.
#21
Moderator
As long as the spread in weight covers the specified ambient temperature [printed in owner's manual], you will be good.
Then it boils down to "are the ratings correct?". Personally I prefer smaller spread in weight like 10-30 over 5-40 and shift (higher number in summer and lower number in winter) as needed.
Then there are other equally important factors like Synthetic (which handles the wider range better), cleansing property, price, availability etc.
Salim
Then it boils down to "are the ratings correct?". Personally I prefer smaller spread in weight like 10-30 over 5-40 and shift (higher number in summer and lower number in winter) as needed.
Then there are other equally important factors like Synthetic (which handles the wider range better), cleansing property, price, availability etc.
Salim
#22
Forgive me for asking newbe questions, BUT, I assume QSUD is a Quaker State oil, but what is "PP" ? When you say your OCI is dependent on how much fuel dilution--are you having oil analysis done to determine fuel dilution or...? If oil analysis, will you share those reports? Am I reading your message correctly that you have more fuel dilution with 0W20 ? Thanks.
#23
#24
Lexus Test Driver
Thread Starter
Forgive me for asking newbe questions, BUT, I assume QSUD is a Quaker State oil, but what is "PP" ? When you say your OCI is dependent on how much fuel dilution--are you having oil analysis done to determine fuel dilution or...? If oil analysis, will you share those reports? Am I reading your message correctly that you have more fuel dilution with 0W20 ? Thanks.
QSUD- Quaker State Ultimate Durability
PP - Pennzoil Platinum
PP w/PP - Pennzoil Platinum with Pure Plus Technology
I can estimate how much fuel dilution in terms of how many cold starts with short trips. I end up with a lot more fuel dilution in the winter because I tend to warm up the car a long time which is just throwing fuel into the oil, and sometimes the trips are less than 1 mile which isn't enough to burn off the fuel.
I've done a UOA(universal oil analysis) once but decided it wasn't worth the money each time for something that isn't necessary.
#25
As long as the spread in weight covers the specified ambient temperature [printed in owner's manual], you will be good.
Then it boils down to "are the ratings correct?". Personally I prefer smaller spread in weight like 10-30 over 5-40 and shift (higher number in summer and lower number in winter) as needed.
Then there are other equally important factors like Synthetic (which handles the wider range better), cleansing property, price, availability etc.
Salim
Then it boils down to "are the ratings correct?". Personally I prefer smaller spread in weight like 10-30 over 5-40 and shift (higher number in summer and lower number in winter) as needed.
Then there are other equally important factors like Synthetic (which handles the wider range better), cleansing property, price, availability etc.
Salim
Ratings being equal, It all leaves me wondering, what does manual recommended 5w30 bring to the engine protection party that 5w20 does not?
Salim, what oils and weights are you using?
#26
Moderator
Dont get confused by the spread.
5W30 means any number is valid for this oil as long at it greater and equal to 5 and less than or equal to 30. So this oil will work in all ranges that 5, 10, 15, 20, 25 and 30 would work.
Salim
5W30 means any number is valid for this oil as long at it greater and equal to 5 and less than or equal to 30. So this oil will work in all ranges that 5, 10, 15, 20, 25 and 30 would work.
Salim
#27
The number preceding the "W" in an oil weight is the cold temperature tested flow behavior. The number right of the "W" is tested viscosity at full operating temperature (generally accepted at 210*F)
Depending on your individual car's blowby, you can fuel dilute your oil well below acceptable protection and you will need to do more frequent oil changes to maintain protection than an oil with a higher SAE operating temp value. IE. a 5w20 or 0w20 oil will potentially shear down to a 5w10/ 0w10 equivalent over time.
A few more mpg is not worth potential accelerated wear or more frequent oil changes IMO. Stick with what the manual recommends or go slightly heavier, not lighter.
#28
Oil wear test results report
Sorry, I'm used to Bob Is The Oil Guy Forum when it comes to talking about Oil that I start using acronyms.
QSUD- Quaker State Ultimate Durability
PP - Pennzoil Platinum
PP w/PP - Pennzoil Platinum with Pure Plus Technology
I can estimate how much fuel dilution in terms of how many cold starts with short trips. I end up with a lot more fuel dilution in the winter because I tend to warm up the car a long time which is just throwing fuel into the oil, and sometimes the trips are less than 1 mile which isn't enough to burn off the fuel.
I've done a UOA(universal oil analysis) once but decided it wasn't worth the money each time for something that isn't necessary.
QSUD- Quaker State Ultimate Durability
PP - Pennzoil Platinum
PP w/PP - Pennzoil Platinum with Pure Plus Technology
I can estimate how much fuel dilution in terms of how many cold starts with short trips. I end up with a lot more fuel dilution in the winter because I tend to warm up the car a long time which is just throwing fuel into the oil, and sometimes the trips are less than 1 mile which isn't enough to burn off the fuel.
I've done a UOA(universal oil analysis) once but decided it wasn't worth the money each time for something that isn't necessary.
Last edited by pilot2; 07-06-14 at 06:15 AM.
#29
Moderator
Salim, the way this is expressed may cause some confusion and be potentially damaging, IMO.
The number preceding the "W" in an oil weight is the cold temperature tested flow behavior. The number right of the "W" is tested viscosity at full operating temperature (generally accepted at 210*F)
Depending on your individual car's blowby, you can fuel dilute your oil well below acceptable protection and you will need to do more frequent oil changes to maintain protection than an oil with a higher SAE operating temp value. IE. a 5w20 or 0w20 oil will potentially shear down to a 5w10/ 0w10 equivalent over time.
A few more mpg is not worth potential accelerated wear or more frequent oil changes IMO. Stick with what the manual recommends or go slightly heavier, not lighter.
The number preceding the "W" in an oil weight is the cold temperature tested flow behavior. The number right of the "W" is tested viscosity at full operating temperature (generally accepted at 210*F)
Depending on your individual car's blowby, you can fuel dilute your oil well below acceptable protection and you will need to do more frequent oil changes to maintain protection than an oil with a higher SAE operating temp value. IE. a 5w20 or 0w20 oil will potentially shear down to a 5w10/ 0w10 equivalent over time.
A few more mpg is not worth potential accelerated wear or more frequent oil changes IMO. Stick with what the manual recommends or go slightly heavier, not lighter.
Salim
#30
For those using a 20 weight oil to attempt to get more mpg, i highly suggest on your personal vehicles to run a baseline oil analysis with the 5w30 stated in the manual and another analysis on your 0w20/5w20 oil if you choose to go that route.
Inform yourselves of any indicated wear and fuel dilution expectancy. Hopefully no red flags of high metal content will surprise you.
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