Oil Change oops... is 10w40 okay??
06-22-14, 01:18 PM
#1
Intermediate
Thread Starter
Oil Change oops... is 10w40 okay??
Yesterday I changed the oil in my F, and as I was pouring in the second to last bottle I noticed that I had 10w40 in my hand instead of the 10w30 that I usually use. I keep 10w40 on hand to use in my high mileage truck and I grabbed a case of that stuff by mistake.
Am I okay running this? Or should I drain it out and refill it with 10w30? I searched the forum and only found one other person who mentioned they use 10w40. It's very expensive stuff (Royal Purple XPR Extreme Performance, $15/qt) so I'd hate for it to go to waste. I live in AZ so am okay with the 10W part, I'm just concerned about the thicker 40 weight.
Am I okay running this? Or should I drain it out and refill it with 10w30? I searched the forum and only found one other person who mentioned they use 10w40. It's very expensive stuff (Royal Purple XPR Extreme Performance, $15/qt) so I'd hate for it to go to waste. I live in AZ so am okay with the 10W part, I'm just concerned about the thicker 40 weight.
Last edited by jleonard71; 06-22-14 at 01:22 PM.
06-22-14, 03:03 PM
#2
When it gets Hot
Now that the weather in Arizona is getting really HOT i would think that the 10W 40 would be a pretty good idea.
The part that would bother me a bit is the High Mileage part. That type of oil has additives that claims to expand seals and gaskets to limit leaks. For example we have a lot of valve stem seals and if the additive penetrates them, they may not shrink when you reintroduce regular oil.
If it was me, I would drain the oil (not the filter) and save it for it's intended use in your truck. You might get 9+ quarts out.
If I lived in Arizona, I would use a quality synthetic (not high mileage) 5W 40 or 10W 40. In normal climates use 5W 30 as recommended.
Loren
The part that would bother me a bit is the High Mileage part. That type of oil has additives that claims to expand seals and gaskets to limit leaks. For example we have a lot of valve stem seals and if the additive penetrates them, they may not shrink when you reintroduce regular oil.
If it was me, I would drain the oil (not the filter) and save it for it's intended use in your truck. You might get 9+ quarts out.
If I lived in Arizona, I would use a quality synthetic (not high mileage) 5W 40 or 10W 40. In normal climates use 5W 30 as recommended.
Loren
06-22-14, 06:21 PM
#4
Intermediate
Thread Starter
Now that the weather in Arizona is getting really HOT i would think that the 10W 40 would be a pretty good idea.
The part that would bother me a bit is the High Mileage part. That type of oil has additives that claims to expand seals and gaskets to limit leaks. For example we have a lot of valve stem seals and if the additive penetrates them, they may not shrink when you reintroduce regular oil.
If it was me, I would drain the oil (not the filter) and save it for it's intended use in your truck. You might get 9+ quarts out.
If I lived in Arizona, I would use a quality synthetic (not high mileage) 5W 40 or 10W 40. In normal climates use 5W 30 as recommended.
Loren
The part that would bother me a bit is the High Mileage part. That type of oil has additives that claims to expand seals and gaskets to limit leaks. For example we have a lot of valve stem seals and if the additive penetrates them, they may not shrink when you reintroduce regular oil.
If it was me, I would drain the oil (not the filter) and save it for it's intended use in your truck. You might get 9+ quarts out.
If I lived in Arizona, I would use a quality synthetic (not high mileage) 5W 40 or 10W 40. In normal climates use 5W 30 as recommended.
Loren
And even though it's hotter outside (110-115° highs), does that increase the engine temps by that much to where a heavier/thicker oil would be okay or even desirable? And in fact, this oil has additives which are supposed to help it run cooler than normal in high performance applications so that might even make it worse than if it were regular synthetic 10W40.
I suppose I could drain it and save it for my truck and refill it with the 10W30, I'd just need to find an uncontaminated container to put it in.
Last edited by jleonard71; 06-22-14 at 06:25 PM.
06-22-14, 07:16 PM
#5
Tech Info Resource
iTrader: (2)
Thicker oil runs hotter. I'd drain it and save it for your other application. Simply put, it takes more energy to pump 40 weight oil, and because it has higher viscosity, it takes more energy from the engine to do the same work, so the engine's operating temperature will go up, and your horsepower will go down.
If your cooling system is working properly, outside air temperature means nothing. Your engine's operating temperature is limited by the cooling system's ability to maintain a stable temperature. There's absolutely no way you need heavier weight oil unless you consistently see oil temps 1 bar from the top of the scale, and then you just need more oil cooling, not heavier oil. You always want to run the lightest possible oil your driving will permit. Always, no exceptions, no maybes.
If your cooling system is working properly, outside air temperature means nothing. Your engine's operating temperature is limited by the cooling system's ability to maintain a stable temperature. There's absolutely no way you need heavier weight oil unless you consistently see oil temps 1 bar from the top of the scale, and then you just need more oil cooling, not heavier oil. You always want to run the lightest possible oil your driving will permit. Always, no exceptions, no maybes.
Last edited by lobuxracer; 06-22-14 at 07:21 PM.
06-24-14, 07:59 PM
#6
Intermediate
Thread Starter
Thanks for the input guys. I didn't think the hotter ambient temps would make my car run any hotter and therefore require thicker oil, I just wanted to make sure. I also emailed Royal Purple directly and they said running 40W instead of 30W wouldn't hurt my engine in any way, though he said my mileage and HP might go down slightly since the engine will be working harder to pump the thicker oil. So I went ahead and drained and refilled it just to be on the safe side, ended up putting the 40W into a Home Depot bucket to use in my truck.
Last edited by jleonard71; 06-24-14 at 09:23 PM.
06-24-14, 09:23 PM
#7
Intermediate
Thread Starter
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06-24-14, 11:21 PM
#9
Intermediate
Thread Starter
They do have 5W-30 in stock for slightly more ($7.99 vs $7.43/qt): http://smile.amazon.com/Pennzoil-550...dp/B00JMCCGDQ/. Only downside to that stuff is it comes in a 6-pack instead of a 5 gallon jug, so you'll have 2 left over after your first change, then 4 after the second change, then you'll break even on your third change.
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