Can I run 0W30 all year?

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Jan 23, 2003
ON, Canada
During the fall I switched over to Pennzoil Long Life 0W30 blend HDEO. I just changed the oil on the car, and now I am on the second interval of Pennzoil Long Life 0W30. So far I am very pleased with it's cold weather performance. Now my question is, would this oil be a good choice to run year round? It has a vicosity of 11.8 cSt @ 100C, which is considerbly thicker than the Pennzoil 10W30 dino (10.5 cSt)that I used to run in the summer. It also has a HTHS of 3.45 which is better than that of 10W30 dino (3.2). Plus, since this oil has 45-55% PAO, it should hold up considerbly better than a dino or other lesser blends. I don't really see any disadvantage to running this oil year round, and it will certainly simplify the logistics for my oil purchases. The oil is going into my daily driver/run around car, a '85 Olds with a 307 Olds V8 (similar clearance specs to a small block Chevy). It gets a lot of city use, a mix of short and medium trips (although usually several throughout the day). The car usually gets one or two good highway trips per oil change interval. I should note that I am not willing to step up to a full synthetic with this car. I also intend to drive it until the wheels fall off. I can get this blend at a very good price, which is part of the reason why I use it. Additionally, winters in this area can go below -35C, so I think the 0W30 is a necessity during the winter months. Summers here typically don't see hotter temps than 35C. So any thoughts on the above? Does anyone have a better suggestion as to what oil to use during the summer months? Pennzoil Long Life 0W30 spec sheet: Pennzoil dino multigrade spec sheet: [ February 09, 2004, 06:32 PM: Message edited by: Oldswagon ]
You can definitely use this! I wish we had this here. It's a nice 11.8cSt so you should be A3 rated or close enough to it. Amsoil's HT/HS for their S2k is 3.4 This one is 3.45 so it's very similar. TBN of 9.0 isn't too bad either.
I started using 0w30 in my Firebird the end of last summer and my first UOA had a lot of hot weather (30C+) driving on it and my results looked great. That Pennzoil 0w30 looks like a very good oil, and can definitely handle summer driving with it's thicker 100c viscosity. How much do you pay for that oil?
Oldswagon, I have used 0W30 M1 (that was BEFORE GC appeared guys...I haven't defected) year round including both very cold and very hot weather in demanding hilly high altitude driving in a Taurus Vulcan engine with nary a problem.
Thank you all for the advice. It looks like I should have no issues with running this oil year round. I am sure this stuff will protect the engine better than the regular Pennzoil dino that this car used previously. williar: The car hasn't used any oil during an OCI with any oil, or at least I haven't noticed an significant movement on the dipstick. The engine in this car is in excellent shape and is spotless inside. Patman: I get 4 quarts of this oil for about $18 with taxes from a local parts store who is a Pennzoil dealer (this is lower than the list price). With a high percentage of PAO and a HDEO additive pack, I figure that this oil is a pretty good bargin.
Wait a sec....I thought that the lower the HTHS number, the better????? someone puh-lease school me here.
Add another who uses 0W30 year round. Amsoil in the Tahoe, Mobil 1 in the Sable (only because I haven't changed the Sable yet.) Used Mobil 1 prior to Amsoil S2K. No problems. Cheers, Doug
Originally posted by Schmoe: Wait a sec....I thought that the lower the HTHS number, the better????? someone puh-lease school me here.
In the same viscosity, a higher HT/HS is generally better. This can be mis-leading in spec. sheets, however. Some oils start out high and deteriorate quickly. Higher quality oils will maintain. Generally, higher is better.
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