Whatever warm-running viscosity difference there'll be between conventional and synthetic blend 5w30 and 10w30 motor oils will be negligible - both will shear down to the high 20s over the first several thousand miles and then build back up as insoluble oxidatives accumulate in the oil. The cold start viscosity will be negligibly close, too, as long as the ambient temperature is around 30 F. or above. My only concerns - and I hasten to add they're probably more theoretical than material - are that 5w30 depends more on its VII package to deliver the 25 pt. viscosity stability spread from cold to hot than the 20 pt. range required of 10w30, and operation in ambient temperature above 90 F. may degrade the 5w30 somewhat quicker than the 10w30.
Oil for Florida climate?
- Thread starter ShortBuSX
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In AEHaas's defence, he has posted a number of used oil analysis that prove his theories. On the other hand, I don't think he tested any thick oils for comparison - maybe the results would have been even better.
From a previous post of mine:
Oil analysis: compare 2003 Ferrari 575 Maranello and 2000 550 Maranello
My neighbor and I have have Maranellos. He own the 550 but has the new SuperAmerica on order. He always runs what the book says. His last oil change was with 9,100 miles on the car. It was 9 or 10 months ago. Last week I sampled the oil with 1,800 miles on this oil.
These cars are nearly exactly the same but for a slightly bored out engine in the newer 575 model. His has 475 BHP and mine has 515. His drive to work is 10 - 15 minutes and mine is 15 - 20 minutes and we drive about the same way, spirited. My car has 6,300 miles on it. I run the 20 wt oil while he has always run the Shell Helix Ultra 5W-40, the factory recommended oil.
One has said that since I get good numbers with the 20 wt oil that I should get better numbers on the 40 wt oil. You be the judge:
__________New _______Ferrari 550_______575
______0W-20 Mobil 1 ___With 1,800 Mi __With 4,100 Mi on the oil
................................................................................................................
Iron__________ Chromium _____ Nickel ________ Aluminum ______3___________8__________9
lead __________ Copper ________ Tin ___________ Silver ________ Titanium ______ Silicon ________4___________6__________8
Boron ________247_________40_________178
Sodium _______15__________8__________15
Potassium ____ Molybdenum __ 164_________18_________86
Phosphorus __1375________ 1203________1243
Zinc ________ 1328________1191________1169
Calcium _____ 3456________1669________2742
Barium ______ Magnesium ____53_________935_________111
Antimony _____ Vanadium _____ Fuel %Vol _____0__________3.0__________1.0
Abs Oxid ______?__________na__________28
Abs Nitr _______?__________11__________4
Wtr %vol ______0_________ Vis CS 100C ___9.0________11.0 _________8.3
SAE Grade ____20_________30 __________20
Gly test ______NEG_______NEG _________NEG
TBN _________9.87_______not done_____not done
I tested my oil using this company, www.youroil.net
Go to this page and download this Excel file to see other peoples results:
http://members.rennlist.com/oil/
He just went to Orlando to purchase an Enzo. It calls for Shell Helix Ultra Racing 10W-60 oil. But my neighbor thinks even he will use a thinner oil for around town. I am guessing the 5W-40 Ultra, probably a good choice.
aehaas
Oil analysis: compare 2003 Ferrari 575 Maranello and 2000 550 Maranello
My neighbor and I have have Maranellos. He own the 550 but has the new SuperAmerica on order. He always runs what the book says. His last oil change was with 9,100 miles on the car. It was 9 or 10 months ago. Last week I sampled the oil with 1,800 miles on this oil.
These cars are nearly exactly the same but for a slightly bored out engine in the newer 575 model. His has 475 BHP and mine has 515. His drive to work is 10 - 15 minutes and mine is 15 - 20 minutes and we drive about the same way, spirited. My car has 6,300 miles on it. I run the 20 wt oil while he has always run the Shell Helix Ultra 5W-40, the factory recommended oil.
One has said that since I get good numbers with the 20 wt oil that I should get better numbers on the 40 wt oil. You be the judge:
__________New _______Ferrari 550_______575
______0W-20 Mobil 1 ___With 1,800 Mi __With 4,100 Mi on the oil
................................................................................................................
Iron__________ Chromium _____ Nickel ________ Aluminum ______3___________8__________9
lead __________ Copper ________ Tin ___________ Silver ________ Titanium ______ Silicon ________4___________6__________8
Boron ________247_________40_________178
Sodium _______15__________8__________15
Potassium ____ Molybdenum __ 164_________18_________86
Phosphorus __1375________ 1203________1243
Zinc ________ 1328________1191________1169
Calcium _____ 3456________1669________2742
Barium ______ Magnesium ____53_________935_________111
Antimony _____ Vanadium _____ Fuel %Vol _____0__________3.0__________1.0
Abs Oxid ______?__________na__________28
Abs Nitr _______?__________11__________4
Wtr %vol ______0_________ Vis CS 100C ___9.0________11.0 _________8.3
SAE Grade ____20_________30 __________20
Gly test ______NEG_______NEG _________NEG
TBN _________9.87_______not done_____not done
I tested my oil using this company, www.youroil.net
Go to this page and download this Excel file to see other peoples results:
http://members.rennlist.com/oil/
He just went to Orlando to purchase an Enzo. It calls for Shell Helix Ultra Racing 10W-60 oil. But my neighbor thinks even he will use a thinner oil for around town. I am guessing the 5W-40 Ultra, probably a good choice.
aehaas
Well, to really make this apples-to-apples comparison, you should put the 5w-40 oil in your car, not his
just to eliminate other variables.
Your friend seems to be having a fuel dillution issue which may be skewing the used oil analysis results. Either his driving patterns are much different from yours or his engine is not as nicely tuned as yours.
Your friend seems to be having a fuel dillution issue which may be skewing the used oil analysis results. Either his driving patterns are much different from yours or his engine is not as nicely tuned as yours.
like you said, you "think" its better. just because you type something does not mean its automatically true.
back on topic. i run 15w40 year round in central and south florida in my gasoline vehicles. when my delo is used up, i have about 9 gallons of castrol tecion 15w40 to go through. i am serously thinking of buying some of that sae30 delo from autozone that audi junkie found.
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