The valvecover on the engine states to only use an oil with the 505.00 rating. I did some looking today at Canadian Tire and there's a decent selection of 505.00 approved oil. Maxlife synth, GC and Syntec 5w40 and M1 5w30. All of those have a CF rating. Should I look for an oil with a CI-4 rating or is the CF with the 505.00 spec acceptable?