I heard this noise today when after a 25 min drive when i pulled into my driveway. I remember checking the oil in the morning before I started and it was at the H mark. The car has not burned any noticeable oil on the dipstick in the last 800 miles. I had a Mobil 1 5w30 EP oil change with Mobil 1 filter done about 2 weeks ago. . I will try to get a video of me reving the engine. The engine has 83k miles on it and belts need to be replaced along with fluids at 90k. The engine pulls hard and does not skip one beat.

I am not sure if it is normal, Fuel damper, Fuel injectors, belts, or something else. Please let me know if this is normal or something that i should look into.

 

Replaced oil with German Castrol (GC) 0W30 and it sounds much better. I was reading more into the thickness of the oil and seems like GC is a much thicker oil than Mobil 1 EP 5w30 almost to the point where it is 40 weight. The GC has higher Kinematic value than Mobil 1 and is Shear stable at a higher value and can maintain it for the interval.



Some examples:

Mobil 1, 10w-30
vis @ 100C = 10.2 Cst
HT/HS @ 150C = 3.0 Cp



Mobil 1, 5w-30
vis @ 100C = 10.6 Cst
HT/HS @ 150C = 3.1 Cp


http://www.mobil.com/USA-English/Lub...rformance.aspx




GC 0W30
vis @ 100C = 12.1Cst
HT/HS @ 150C = 3.6 Cp





http://www.bobistheoilguy.com/forums...t&Number=47725

http://bobistheoilguy.com/forums/ubb...1546790&page=1

 

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It'd also always difficult to diagnose noise over video or Internet nut that thud sounds a bit louder than normal. Valve tick and valve train is a higher pitched noise. That said maybe the microphone is distorting the noises.

I have never been a fan of Mobil1 oils. Have you tried a really durable Group 5 oil such s Motul 10/40? You live in a hot climate so I would be looking for higher viscosity oils. The noises will likely become even more muted. Call our shop if you can't find locally and need some shipped to you