Thinner is better ??

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289
Location
New Jersey
1) Is it just me or are thin oils the best of both worlds? 2) Better flow equals better protection, no? 3) Better flow equals better cleaning, no? 4) Does a 0w40 flows like a 0 at startup and protects like a 40? 4 questions, 4 answers will suffice. Thanks. -A
 
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4,431
Location
Massachusetts
Oh man. Not another one. We just did 14 pages of thin is in.
 Originally Posted By: ARMY_Guy
1) Is it just me or are thin oils the best of both worlds?
No. They have their place, just like thicker oils.
 Originally Posted By: ARMY_Guy
2) Better flow equals better protection, no?
No. Ask a diesel engine or BuickGN.
 Originally Posted By: ARMY_Guy
3) Better flow equals better cleaning, no?
No, thinner oil does not clean better.
 Originally Posted By: ARMY_Guy
4) Does a 0w40 flows like a 0 at startup and protects like a 40?
Sure.
 
Messages
2,537
Location
Rochester, MI, US, World
i thought 5w-20 oils held their higher viscosities (i.e. the "20") better than 5w-30 oils... there is less potential of a shear effect because the viscosity doesn't cover as large of a range. maybe im wrong, so dont hold me to it.
 
Messages
1,714
Location
CA.
 Originally Posted By: ARMY_Guy
1) Is it just me or are thin oils the best of both worlds? 2) Better flow equals better protection, no? 3) Better flow equals better cleaning, no? 4) Does a 0w40 flows like a 0 at startup and protects like a 40? 4 questions, 4 answers will suffice. Thanks. -A
1. Maybe 2. Maybe 3. Maybe 4. No 0W20 flows faster at start up than a 0W40.
 
Messages
656
Location
Portland, OR
After reading all these posts plus tons of others I have decided to use 5-30 instead of 5-20. Why you may ask? Dosent it just make sense! If you have questions about 5-20 being too thin, or shearing down to a 5-10 then why not just use 5-30? Is it too thick? No because its a 5 wt, it was recomended in the exact same engines before 5-20 became "the thing", and much thicker oil is recomended in everyother place besides north america. But 5-30 is cheaper oil and just sheares down to 5-20: Ok well I guess you only have to live with the 5-30 for a month and then you have 5-20! It dosent flow as well in cold temps: Its a 5wt how different can it be, and it has far better flow than the 10-30 that you used 10 years ago. My oil cap says 5-20: well in a month it will be 5-20. Your owners manual probably says to only use oem fluids and parts too, or only service you car at the dealership but you dont do that. 5-20 gives me better gas milage: Barely! And remember the 5-30 will be 5-20 in a month so I think your ok. I think the answer is obvious! But poke holes, I know its comming.
 
Messages
1,714
Location
CA.
 Originally Posted By: ryland
After reading all these posts plus tons of others I have decided to use 5-30 instead of 5-20. Why you may ask? Dosent it just make sense! If you have questions about 5-20 being too thin, or shearing down to a 5-10 then why not just use 5-30? Is it too thick? No because its a 5 wt, it was recomended in the exact same engines before 5-20 became "the thing", and much thicker oil is recomended in everyother place besides north america. But 5-30 is cheaper oil and just sheares down to 5-20: Ok well I guess you only have to live with the 5-30 for a month and then you have 5-20! It dosent flow as well in cold temps: Its a 5wt how different can it be, and it has far better flow than the 10-30 that you used 10 years ago. My oil cap says 5-20: well in a month it will be 5-20. Your owners manual probably says to only use oem fluids and parts too, or only service you car at the dealership but you dont do that. 5-20 gives me better gas milage: Barely! And remember the 5-30 will be 5-20 in a month so I think your ok. I think the answer is obvious! But poke holes, I know its comming.
I can see using a 5W-30 in place of a 5W-20 but I wouldn't use anything 50 grade unless my engine was burning and blowing oil like mad, or if I planned on racing the car in the hot summer. I would only do that if the mfg ok'ed a 50 weight oil.
 
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