<div layer1="text-s"></div><div class="tz-paragraph">首保加差价120换5W—30全合成机油，不知道是5-30机油合适还是5-40机油合适？</div><div layer1="text-e"></div><br /><div layer1="img-s"></div><div class="tz-figure"><img src="http://club2.autoimg.cn/album/g29/M04/1B/F6/userphotos/2019/07/17/11/500_ChsEfl0unBKACNR1AAjxhHwPBhw711.jpg" style="height:4608px;width:2208px"  /><div layer2="desc-s"></div><div class="description">5-30机油SN级</div><div layer2="desc-e"></div></div><div layer1="img-e"></div><br /><div layer1="img-s"></div><div class="tz-picture"><img src="http://club2.autoimg.cn/album/g27/M07/20/10/userphotos/2019/07/17/11/500_ChcCQF0unBiAX9qMAAtv6tLW7LU289.jpg" style="height:4608px;width:2208px"  /></div><div layer1="img-e"></div><br />

哪种机油合适？