I have a '96 XJ with about 66k on it. I did a tune up yesterday, but before I did that, we poured a can of GM Top Engine Cleaner down the throttle body, per instructions on the can. After sitting 2.5 hours, the XJ fired right up without problem, but was running a little rough. I thought it was supposed to be hard to start?
Well it smoked for 4 or 5 minutes, and then I changed the oil on it. I was previously running Amsoil series 2000 0w30, but thinking this might be a little too thin, I switched to Amsoil series 7500 10w30 (supposedly thicker?). I'm going to switch again to 5w40, but I didn't have any on hand.
I have now noticed my oil pressure is about 10 pounds lower, at idle, than it was with the 0w30, and before running the cleaner. It is also about 5 pounds lower at speed, and at cold idle.
Right now I'm getting about 45ish driving, and about 25ish idling. Could it be that the engine cleaner cleaned up enough gunk that the oil now has a larger space to travel, hence the lower pressure? The engine was pretty clean to begin with. Or do you think it was caused by the 0w30 to the 10w30 switch? The Amsoil rep said 0w30 is safe to use in place of all 5w30 and 10w30 applications.
What do you think?
Well it smoked for 4 or 5 minutes, and then I changed the oil on it. I was previously running Amsoil series 2000 0w30, but thinking this might be a little too thin, I switched to Amsoil series 7500 10w30 (supposedly thicker?). I'm going to switch again to 5w40, but I didn't have any on hand.
I have now noticed my oil pressure is about 10 pounds lower, at idle, than it was with the 0w30, and before running the cleaner. It is also about 5 pounds lower at speed, and at cold idle.
Right now I'm getting about 45ish driving, and about 25ish idling. Could it be that the engine cleaner cleaned up enough gunk that the oil now has a larger space to travel, hence the lower pressure? The engine was pretty clean to begin with. Or do you think it was caused by the 0w30 to the 10w30 switch? The Amsoil rep said 0w30 is safe to use in place of all 5w30 and 10w30 applications.
What do you think?