Castrol Blend

[JMI]

Life use to be simple before the 89 535i came into the picture. Need oil? Get a good 10w-40 dino oil and forget about it.

Will be doing the first oil change since acquiring the car. The car was well taken car of by previous 2 owners. As far as I can determine it always had dino oil in it. From peering into the valve cover from the oil fill cap, admittedly not an extensive view, the valve gear looks in good shape from a lubrication standpoint. Light varnish but absolutely no signs of sludge, carbon, or other deposits. Not bad for 120,000 miles.

Have read a lot on the forum about synthetics in general and Mobil 1 in particular. The concerns about loosing up crude that will plug the oil galleys/filters or cause previously good seals to start leaking. Read this may have been true with the early blends but not much of a problem now, the leaking seals that is.

Went to the Mobil 1 website:
http://www.mobil1.com/
and they don’t even recommend a synthetic oil, (don’t have one in the correct viscosity range, or so they say), but say to use a high mileage dino oil with seal conditioners, Mobil Clean High Mileage 10W-40.

Checked out the Castrol website:
http://www.castrol.com/
and they where a little more flexible, recommending several types, dino, full synthetic, and synthetic blend.

Leaning towards trying the Castrol blend for the coming oil change to see how it goes. They recommend a 5w-20, but that seems a little thin for the Pacific Northwest (Seattle), so I thinking 10w-30.

Any opinions on the Castrol Blend?

TIA