i live in florida so the winters are never cold enought to effect the oil. i was just trying to save some money and i figured the thicker oil wouldn't leak as much thanks for all responses.

 

I run Delo 400 15w40 with some lucas oil stabilizer...I have some real good friends that own a machine shop where they build high performance round track motors and when they are installing bearings and things of that nature it all gets a coat of lucas oil stabilizer on it first. The stuff is great, quieter on startups and supposedly has no adverse effect on flow or the pump. We use it in all of our tractors, semis and vehicles for the last several years with absolutley no problems...

 

none... I ran 15w-50 mobil 1 year round in my 5.9...

 

Lucaswilldefinitely thicken up any oil you add it to. I use it sometimes as well.
It probably turned your 40 wt to a 60 wt.That's pretty thick for cold weather.

Consider running a 10w30 Delo and adding the Lucas

 

In southern California or Florida, using that would probably be just fine.

If you travel north into the colder states at all during the winter for any length of time, consider running something thinner in advance. Like others have said, thats pretty thick for some states in the winter. According to my manual, 10w30 is OK to use down to zero degrees. I run that during the summer and 5w30 during the winter since it does regularly drop below zero here in the midwest.

 

You wont have issues running 15W-40 in a 5.2L gas engine. You may consider a lighter weight for winters 5W or 10W so the oil flows quicker. 15W is a thick oil for winter and will take many, many more seconds to flow upon start up.

I have been running 15W-40 from May to October and 10W-30 during my western NY cold months since the truck was new. I went this way because I tow often. Your benefits from 15W-40 will be a higher TBN meaning your oil will absorb and store acids much longer than traditional gas engine oils (I'm not talking about the extended drain oils; they have higher TBN).

If you like to 40 weight at operating temp, but like the higher TBN of the diesel oils, take a peek at Mobil's 5W-40 for winter use.

 

I run Mobil 1 10w-40 synthetic and I have 139k on mine. It doesn’t use or burn oil. I have had the plenum gasket replaced, that fixed the only leak I had.

 

Throwin this out since the thread is related;

When I do my plenum, timing chain, water pump, etc. this coming mon-wed. I'm changing my oil out to Castrol GTX 10w40 and adding a quart of the 8 cylinder Restore. Once I run this for x amount of miles, or I get my surplus , I'll be changing to Royal Purple 10w30.

Question: Should I use some of that oil Stabilizer or Lucas with the restore? I think that would be too many additives at one time, IMO.

 

If you really want to add Restore I wouldn't add anything else.
Why do you want to run Restore? Have you got compression or ringproblems?

 

I have an 87 with the 318 and at the first oil change it got 20w50. Never been nothing else in it and still going strong at 160,000 miles.