please share odometer reading and maintenance history of your vehicle.
which engine oil grade used in during maintenance cycle,
oil consumption in a petrol engine happens due to plenty of reasons basics can be:
- bad valve seals
- bad pcv valve
- bad rings (on pistons)
or there is some kind of oil leakage under the engine check your car porch parking bay for oil spots.
for a petrol engine doing compression test by a reasonable workshop is like brushing your teeth in morning. for a V8 engine compression test is flossing the tiger.
without compression test if a mechanic 'DECLARE ENGINE IS WEAK' , he is either high or consider owner a gold egg laying duck.
for diesel engine it is bit tricky and need some extra tools.
however in order to understand what can be wrong with engine you must know the specs of your vehicle.
locate vehicle ID sticker over passenger side pillar or driver side pillar - take a picture and start using google to decipher your vehicle specs.
click & read this page. come back with more questions. Being PW member you have advantage to read understand and make queries, so that mechanics can not make you lay an gold Egg for them
in your case of petrol V8 4700 cc 2UZ FE for compression test i can recommend visit to Jamil Autos at Shahrae Quaideen. 0300 223 7538
don't feel offended by this response, you need help / guidance please stay calm and reply
@Hassan1991 @dani_kk @rajaatta @VCheng @SER_GTR @babarhyd