4.4 Dry start knock mobile1 0-40
 

Ok my test has begun my 2001 4.4 with 70,000 miles has been doing the dry start knock only twice this summer but one it got cold it knocks for about 2 seconds almost every morning I changed my oil from castrol synthetic 5-30 to mobile1 0-40 full synthetic thursday my reults so far 9-28-2007 no knock 9-29-2007 no knock 9-30-2007 no knock 10-1-2007 no knock 10-2-2007 to 10-6-2007 no knock 10-7-2007 well it get really cold last night 31 deg. verry slight knock on start only for about .5 second first time since I changed to 0-40 10-8-2007 to 10-15-2007 no knock at all 10-16-2007 to 10-21-2007 no knock and it is really cold and snowing so far so good 10-25-2007 still no knock 10-26-2007 to 11-5-2007 still no knock seems to be working

I run 0-40 in my FJZ-80. Its worked wonderful. Will be interesting to see how it does in your X......

What were you using before? I have run Mobil 1 in all my vehicles(except the X5) for the last 30 yrs. Never had a problem and only compliments on how clean the oil pan was when checking at 100K. Great product. Will be switching the 2001 over to it next oil change.

I was running castol gtx 5w-30w

Utahx5
I added another comment after I stated that the M-1, 0-40 had solved the knock issue. The knock is back with a vengence, I hear it almost every time I start however; the dealer changed the cam chain tensioner (as a guess), they will change the oil pump on Wednesday 10/17/07, I'll post the results after a few days. It seems that there is a check valve built onto the oil pump that may be sticking, therefore allowing the oil to drain back out of the galleries, prompting the knock. I asked them to put a direct reading gage on the system to see what the reading were but, I think they like to experiment with these things. Fortunately for me, the warranty covers experimentation too.
Kelsvile

when did your knock start? perhaps has to do with winter gas coming into rotation...

OK, The dealer compleated the surgery: new cam chain tensioner and oil pump, verdict: KNOCKS EVEN MORE OFTEN! I think the "more often is because they changed the oil from 0/40 back to 5/30. I had the "Thats whatthese do at that milage" lecture when I picked it up. They say it is the Vanos system clattering but, what I don't understand is why wouldn't it rattle all the time, why just at start and why did it suddenly start after an oil change? Well that's my story, I now have 85,000 miles on it and it's too damn embarrasing to keep it because it turns every head when I start it up.

kelsvile try bleeding the air out of the system let the car warm up to full temp run it in neutral at 2500 rpm for 5 minutes let it idle for 5 minutes then do it again at 3000 rpm for 5 minutes

The rattle your describing sounds like lifter chatter. It's normal, there is no damage being done. When the engine shuts down, if the cam is holding a valve open the valve spring pushes against the lifter. The end result is the oil in the lifter seeps out and back to the oil pan. Upon start up that valve and lifter chatter until engine oil pressure refills the the lifter. My 2001 4.4 chatters occasionally and she has 126000 miles on her. It is worse when I don't drive her for several days (more time for the oil to seep out).

The only way to stop the chatter is to replace the lifters. In case your thinking of having it done, don't. You'll be wasting your money.

supersteve: love the listing of your lawnmower - any mods planned? headlights for night mowing? Sirius or XM? :rofl: