Can changing engine oil make leaks start?

[JeremyT101]

Thanks alot guys. Its a gas 4.0L. The leaks seem to have 'stopped' themselves up now. I drove 600km+ this weekend to the cottage and the oil level stayed right the same. I will keep an eye on it though, as well as the driveway. This is the second oil change I have done where I used rotella. When I first got the truck the oil was BLACK. It was obvious that the oil hadn't been changed in well, far too long I'm assuming. This oil really appears to do good things for the engine though. The engine sounds much happier with it in it. After doing a full tune (plugs, wires, oil, good injector cleaner, filters) it went from essentially shaking the truck at stop lights at idle, to a perfectly smooth and quiet.

[tacr2man]

The reason I asked whether gas or diesel is that Rotella is a high detergent diesel engine oil . It is probably not the ideal choice for a rover v8 engine especially after it has a lot of miles under its belt . It will clean your engine out , thats for sure with a few unexpected results possible . A 15/40 is probably Ok for a winter oil, but a hot summer a 20/50 would be a better choice . The rover V8 is a fairly low pressure lube engine JMHE

[Daryl]

The reason I asked whether gas or diesel is that Rotella is a high detergent diesel engine oil . It is probably not the ideal choice for a rover v8 engine

I completely disagree. Once you start looking at what oils have enough ZDDP for flat tappet motors compared to what is easily available in most of the US Rotella T is one of the obvious choices. Not just for Rovers but the old Porsche crowd and anyone else dealing with this issue. Most oils have had the ZDDP reduced to what most believe are inadequate levels for flat tappet motors (because ZDDP adds to pollution and shortens cat life combined with the fact that no one is producing new motors with high pressure interfaces like flat tappets).

[baja5337]

combined with the fact that no one is producing new motors with high pressure interfaces like flat tappets).

The jag 4.4 v-8 motor is a flat tappet engine (because its dual overhead cam design)

just an FYI

[JeremyT101]

I completely disagree. Once you start looking at what oils have enough ZDDP for flat tappet motors compared to what is easily available in most of the US Rotella T is one of the obvious choices. Not just for Rovers but the old Porsche crowd and anyone else dealing with this issue. Most oils have had the ZDDP reduced to what most believe are inadequate levels for flat tappet motors (because ZDDP adds to pollution and shortens cat life combined with the fact that no one is producing new motors with high pressure interfaces like flat tappets).

This is exactly what I had read and why I choose to go with this oil. There isn't much discussion of it here, but on Dweb, and other LR forums this is the baseline oil that everyone recommends. Plus, a clean engine is a much happier engine I feel, if leaks happen, then I can deal with them when they do.

[1911]

Once you start looking at what oils have enough ZDDP for flat tappet motors compared to what is easily available in most of the US Rotella T is one of the obvious choices. Not just for Rovers but the old Porsche crowd and anyone else dealing with this issue.

Us old Land Cruiser guys too; all the F-series engines are flat-tappet motors.

[Daryl]

The jag 4.4 v-8 motor is a flat tappet engine (because its dual overhead cam design)

just an FYI

Really? That's pretty interesting. Thanks.

I think I'll look into what they are recommending for oils on those, as it may be useful for those of us with more "seasoned" flat tappet motors.