5w30

Crazycaraudio · 01-08-2012, 03:49 PM

ok so i was just wonder. my jeep need some oil and my mom has some castrol gtx high mileage 5w30. i usually put 10w30. i was wondering if i could top it off with the 5w30. is it even safe to do that?

unidentifiedbomb · 01-08-2012, 03:51 PM

I have 5w30 in mine now, it works but i wouldn't recommend it. The warmer my jeeps gets the more my oil gauge drops

djb383 · 01-08-2012, 04:03 PM

At operating temp, both 5W30 and 10W30 are the same viscosity and flow the same. 5W30 will flow slightly quicker than 10W30 from the bottom of the motor to the top when temp is below normal operating temp.

Thunder & Lightning · 01-08-2012, 04:34 PM

Quote:

Originally Posted by Crazycaraudio

ok so i was just wonder. my jeep need some oil and my mom has some castrol gtx high mileage 5w30. i usually put 10w30. i was wondering if i could top it off with the 5w30. is it even safe to do that?

Top it off no problem.

tjwalker · 01-08-2012, 06:59 PM

If the outside temp is primarily above 60 degrees farenheit, I use 10-30

If the outside temp is primarily BELOW 60 degrees farenheit, I use 5-30

Topping off a crankcase full of 10-30 is absolutely not an issue. As a percentage of the total oil, topping off is insignificant and changes nothing. Unless you are two quarts low!

01-08-2012, 04:03 PM	#3
djb383 CF Veteran Garage is empty, add now Join Date: Nov 2009 Location: The Republic of TEXAS Posts: 5,986 My Photos 1998 Cherokee Engine: 4.0L HO Transmission: Auto w/B&M 70264 auxiliary cooler Transfer Case: N/A Rear Axle: 3.55 PowerTrax No-Slip locker Tires: 235/70/15 Lift Specifications: Stock Misc Accessories: Magnaflow 2.5" exhaust	At operating temp, both 5W30 and 10W30 are the same viscosity and flow the same. 5W30 will flow slightly quicker than 10W30 from the bottom of the motor to the top when temp is below normal operating temp. __________________ Man Law - hoods should be raised at least once a week....have a look.

01-08-2012, 06:59 PM	#5
tjwalker CF Veteran Garage is empty, add now Join Date: Nov 2010 Location: In the middle of Minnesota! Posts: 4,288 My Photos 1999 Cherokee Engine: 4.0 Transmission: AW4 Transfer Case: NV242 Lift Specifications: No lift. Bone stock	If the outside temp is primarily above 60 degrees farenheit, I use 10-30 If the outside temp is primarily BELOW 60 degrees farenheit, I use 5-30 Topping off a crankcase full of 10-30 is absolutely not an issue. As a percentage of the total oil, topping off is insignificant and changes nothing. Unless you are two quarts low! __________________ Without data, all you have is an OPINION! Past Jeeps: '49 Willys, '81 Scrambler, '88 Comanche Current Jeep: 1999 XJ Sport, bone stock, daily driver. I work on Jeeps!!

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01-08-2012, 03:51 PM	#2
unidentifiedbomb CF Veteran 1988 Jeep Cherokee Join Date: May 2011 Location: New Jersey Posts: 1,117 My Photos 1988 Cherokee Engine: I6 4.0 Transmission: AW4 Transfer Case: 242 Front Axle: HP dana 30 Rear Axle: dana 35 Tires: 31" Bf Goodrich T/A on Wrangler Canyons Lift Specifications: 3.5 rusty's full pack Misc Accessories: Flowmaster 44	I have 5w30 in mine now, it works but i wouldn't recommend it. The warmer my jeeps gets the more my oil gauge drops

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