Have a '93 Ford Ranger 2.3L with nearly 300,000 miles. Doesn't burn much oil but on cold starts I hear a lot of top end noise for 2 or 3 seconds. Right now it has 5W30. Would 10W40 help? Or go the other way with 0Wsomething? Either the thinner oil would flow better and thus reach the top end faster, but on the other hand it would drain off more when you shut down the engine and wouldn't reach the top end fast enough on the next cold start. But the thicker oil might stay longer in the top end after shut down but may be more difficult pump up to the top when cold.