I'm not sure why you'd change the oil after only 1,000 miles when switching to synthetic since it is fully compatible with regular engine oil. I personally would switch oils and then change again at the normal schedule which is 3,500 miles for me.

Chuck

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1983 300td 240k (down with bad tranny)
1984 300d 222k (daily driver) "Olive"
1997 GMC K2500 105k (sled dog limo)

"The scenery in ANWR is as spectacular as the Grand Canyon and the wildlife is more impressive."