I need engine help

Quicksilvers

In my experience if you are going to choose a shop to bring your vehicle to they need to have experience or specialize in the VQ37HR engine as it is a complexed engine that requires knowledge. Your missing motor oil or coolant went somewhere it would be a good idea to get a leak down test and compression test to find out the health of your engine or begin tear down and replace your engine it is your choice and your diagnosis should determine this. In my experience I have used Royal Purple motor oil in a 4.6L 2V V8 engine and at 99k miles it had three internal rod bearings fail. After doing my oil research I found that Royal Purple is a snake oil and from the oil analysis tests I read the four ball bearing test and metal shearing test was high on wear which led me to believe the lubrication properties in Royal Purple motor is thin and does not protect your engine well at all comparing to other motor oil brands on the market. My decision was to never use Royal Purple motor oil in any of my engines again as I found there are other motor oil brands that will protect your internal engine parts a lot better. Also not changing your motor oil and filter on time can be detrimental to your engine. If you search there are reputable engine builders out there. In my experience MA Motorsports and Import Part Pros are excellent choices as they both have experience with the VQ37HR engine.

xsamis

This is good information to know because this is the first time ive used royal purple in ANY car, and this is the first time ANY of my cars have died like that... Redline it is next time, my only thing is i live in MI, and the onyl thing remotely close to me is 6 hours away... So if i went with import parts pro or MA motorsports i would literly pay probably thousands just to ship the engine there and back lol

Quicksilvers

True the fourth character in the Nissan VIN# does indicate the engine type. All the 370Z VQ37HR engines are all interchangeable/universal. If you are going to choice to run synthetic motor oil I highly recommend Redline 5W30 or Motul 5W30.

xsamis

So should i buy a used engine with the vin number ending in A for the 370z? I guess my question is, is the Z and G motor the exact same thing in terms of internals, power, how it fits, etc etc, because a G motor is literly half the price of a Z motor... Maybe im overthinking it

Quicksilvers

The VQ37HR engine in the 370Z and G37 is the same engine the only difference I know of I talked to a Nissan engineer before about the differences between the 370Z and G37 models and Nissan made the tuning parameters and values more aggressive in the 370Z and slightly more conservative tuning in the G37 other then that it is the same. Be careful purchasing a used engine as you want to purchase a used engine from a reputable source and know the last recorded mileage before the engine was removed from the vehicle and the possibility of determining the history behind the engine. Try to find a used engine with some what lower mileage would be recommended. Others I know and myself have purchased short blocks and long blocks from IPP with success. IPP has a lot of experience with the VQ37HR platform. There are also a lot of other vendors out there as well if you search.

xsamis

Also lets say i buy a used engine for the time being, and send mine out in the future or slowly start building the one i have, do i have to have a certain vin number letter for a used engine? I guess my question is, is an engine from a g37/ q40/q50 the same engine as my Z's, i dont want anything underpowered lol and dont want inertchangability issues, a friend of mine told me it goes by the 4th letter of my vin